diff --git a/packages/editor/src/components/editor/wall-opening-highlights.tsx b/packages/editor/src/components/editor/wall-opening-highlights.tsx
index 6718acb6..a72bfc1b 100644
--- a/packages/editor/src/components/editor/wall-opening-highlights.tsx
+++ b/packages/editor/src/components/editor/wall-opening-highlights.tsx
@@ -3,8 +3,16 @@
 import { type AnyNodeId, sceneRegistry, useLiveNodeOverrides, useScene } from '@pascal-app/core'
 import { useViewer } from '@pascal-app/viewer'
 import { createPortal, useFrame, useThree } from '@react-three/fiber'
-import { useEffect, useMemo, useRef } from 'react'
-import { BoxGeometry, type BufferGeometry, EdgesGeometry, type Group, Vector3 } from 'three'
+import { useEffect, useLayoutEffect, useMemo, useRef } from 'react'
+import {
+  BoxGeometry,
+  type BufferGeometry,
+  EdgesGeometry,
+  type Group,
+  type Mesh,
+  MeshBasicMaterial,
+  Vector3,
+} from 'three'
 import { LineBasicNodeMaterial, MeshBasicNodeMaterial } from 'three/webgpu'
 import { EDITOR_LAYER } from '../../lib/constants'
 
@@ -41,6 +49,13 @@ const fillMaterial = new MeshBasicNodeMaterial({
   depthWrite: false,
 })
 
+// Keep the cutout in the render list for the outliner's override material
+// without letting its source material alter the normal scene pass.
+const outlineProxyMaterial = new MeshBasicMaterial({
+  colorWrite: false,
+  depthWrite: false,
+})
+
 function makeOutlineGeometry(width: number, height: number, depth: number): BufferGeometry {
   const box = new BoxGeometry(width + PAD, height + PAD, depth + PAD)
   const edges = new EdgesGeometry(box)
@@ -60,26 +75,60 @@ function makeOutlineGeometry(width: number, height: number, depth: number): Buff
  */
 export function WallOpeningHighlights() {
   const selectedIds = useViewer((state) => state.selection.selectedIds)
+  const hoveredId = useViewer((state) => state.hoveredId)
   const { scene } = useThree()
+  const outlineProxyIds = Array.from(new Set(hoveredId ? [...selectedIds, hoveredId] : selectedIds))
 
-  if (selectedIds.length === 0) return null
+  if (selectedIds.length === 0 && !hoveredId) return null
 
-  return createPortal(
+  return (
     <>
-      {selectedIds.map((id) => (
-        <SelectionOpeningHighlights key={id} selectedId={id} />
+      {outlineProxyIds.map((id) => (
+        <OpeningOutlineProxy key={id} openingId={id} />
       ))}
-    </>,
-    scene,
+      {selectedIds.length > 0 &&
+        createPortal(
+          <>
+            {selectedIds.map((id) => (
+              <SelectionOpeningHighlights key={id} selectedId={id} />
+            ))}
+          </>,
+          scene,
+        )}
+    </>
   )
 }
 
-// Resolves a selected node into the opening highlight(s) to draw:
-//  - a selected wall → a hint over each door / window it hosts ("editable
-//    child here").
-//  - a directly-selected frameless opening (a `door` whose `openingKind` is
-//    `'opening'`) → a fill over its own cutout, so the selection reads as
-//    occupied even though the opening renders no geometry of its own.
+function OpeningOutlineProxy({ openingId }: { openingId: string }) {
+  const node = useScene((state) => state.nodes[openingId as AnyNodeId])
+  const geometryRevision = useViewer((state) => state.geometryRevision)
+  const proxyRef = useRef<Mesh | null>(null)
+  const isFramelessOpening = node?.type === 'door' && node.openingKind === 'opening'
+
+  useLayoutEffect(() => {
+    void geometryRevision
+    if (!isFramelessOpening) return
+    const root = sceneRegistry.nodes.get(openingId as AnyNodeId)
+    const proxy = root?.getObjectByName('cutout') as Mesh | undefined
+    if (!proxy) return
+
+    proxy.material = outlineProxyMaterial
+    proxy.visible = true
+    proxyRef.current = proxy
+
+    return () => {
+      proxy.visible = false
+      proxyRef.current = null
+    }
+  }, [geometryRevision, isFramelessOpening, openingId])
+
+  useFrame(() => {
+    if (proxyRef.current) proxyRef.current.visible = true
+  })
+
+  return null
+}
+
 function SelectionOpeningHighlights({ selectedId }: { selectedId: string }) {
   const node = useScene((state) => state.nodes[selectedId as AnyNodeId])
 
@@ -94,27 +143,9 @@ function SelectionOpeningHighlights({ selectedId }: { selectedId: string }) {
     )
   }
 
-  if (node?.type === 'door' && node.openingKind === 'opening') {
-    return <SelectedOpeningHighlight openingId={selectedId} parentId={node.parentId} />
-  }
-
   return null
 }
 
-// A frameless opening selected on its own. Pulls the cutout depth from its
-// host wall's thickness so the fill block matches the wall it sits in.
-function SelectedOpeningHighlight({
-  openingId,
-  parentId,
-}: {
-  openingId: string
-  parentId: string | null
-}) {
-  const parent = useScene((state) => (parentId ? state.nodes[parentId as AnyNodeId] : undefined))
-  const depth = parent?.type === 'wall' ? (parent.thickness ?? 0.1) : 0.1
-  return <OpeningHighlight depth={depth} openingId={openingId} />
-}
-
 function OpeningHighlight({ openingId, depth }: { openingId: string; depth: number }) {
   const node = useScene((state) => state.nodes[openingId as AnyNodeId])
   // Resize arrows publish width/height to the live-override store during the
diff --git a/packages/editor/src/lib/glb-export.test.ts b/packages/editor/src/lib/glb-export.test.ts
index 6e07c38b..94c0e7de 100644
--- a/packages/editor/src/lib/glb-export.test.ts
+++ b/packages/editor/src/lib/glb-export.test.ts
@@ -78,6 +78,22 @@ describe('prepareSceneForExport', () => {
     expect(meshes).toHaveLength(1)
   })
 
+  test('strips presentation-only geometry marked by its renderer', () => {
+    const root = new THREE.Group()
+    const siteGround = meshWithNodeMaterial(nodeMaterial())
+    const horizonDisc = meshWithNodeMaterial(nodeMaterial())
+    horizonDisc.userData.pascalExport = 'strip'
+    root.add(siteGround, horizonDisc)
+
+    const { scene } = prepareSceneForExport(root, {})
+
+    const meshes: THREE.Mesh[] = []
+    scene.traverse((object) => {
+      if ((object as THREE.Mesh).isMesh) meshes.push(object as THREE.Mesh)
+    })
+    expect(meshes).toHaveLength(1)
+  })
+
   test('neutralises an invisible hitbox root but keeps its visible children', () => {
     // Door/window roots are selection hitboxes: a box geometry with an invisible
     // material (object stays visible). Left intact it would plug the wall opening.
diff --git a/packages/editor/src/lib/glb-export.ts b/packages/editor/src/lib/glb-export.ts
index add2ea99..e6b67b5b 100644
--- a/packages/editor/src/lib/glb-export.ts
+++ b/packages/editor/src/lib/glb-export.ts
@@ -185,6 +185,10 @@ const PLACEHOLDER_MATERIAL = new THREE.MeshBasicMaterial({ visible: false })
 
 /**
  * Strip everything that must not bake into the model:
+ *  - Renderer-owned presentation geometry explicitly marked
+ *    `userData.pascalExport = 'strip'` (for example the site's 800 m horizon
+ *    disc). These meshes make the authoring viewport look grounded but aren't
+ *    part of the portable scene artifact.
  *  - Editor overlays on non-scene layers (gizmos, selection handles, ground
  *    grid, zone fills). The editor camera shows them via extra layers; a
  *    thumbnail/bake is layer 0 only. Scene-layer affordances that can't be
@@ -199,6 +203,10 @@ const PLACEHOLDER_MATERIAL = new THREE.MeshBasicMaterial({ visible: false })
 function pruneNonRenderableMeshes(root: THREE.Object3D, identityNodes: Set<THREE.Object3D>) {
   const toRemove: THREE.Object3D[] = []
   root.traverse((object) => {
+    if (object.userData.pascalExport === 'strip') {
+      toRemove.push(object)
+      return
+    }
     // Editor-only overlays (gizmos, selection handles, ground grid, zone fills)
     // live off the scene layer; the editor camera shows them via extra layers
     // but a thumbnail/bake only wants layer 0. Drop the whole overlay subtree —
diff --git a/packages/nodes/src/item/renderer.tsx b/packages/nodes/src/item/renderer.tsx
index 0dd6242a..6fdac599 100644
--- a/packages/nodes/src/item/renderer.tsx
+++ b/packages/nodes/src/item/renderer.tsx
@@ -20,6 +20,7 @@ import {
 } from '@pascal-app/core'
 import {
   type ColorPreset,
+  configureKtx2Support,
   createDefaultMaterial,
   createSurfaceRoleMaterial,
   ErrorBoundary,
@@ -34,7 +35,7 @@ import {
 } from '@pascal-app/viewer'
 import { useAnimations } from '@react-three/drei'
 import { Clone } from '@react-three/drei/core/Clone'
-import { useFrame, useLoader } from '@react-three/fiber'
+import { useFrame, useLoader, useThree } from '@react-three/fiber'
 import { Suspense, useCallback, useEffect, useLayoutEffect, useMemo, useRef, useState } from 'react'
 import type { AnimationAction, Group, Material, Mesh, Object3D } from 'three'
 import { MathUtils } from 'three'
@@ -209,7 +210,8 @@ const BrokenItemFallback = ({ node }: { node: ItemNode }) => {
 
 let itemDracoLoader: DRACOLoader | null = null
 
-const configureItemModelLoader = (loader: ItemGLTFLoader) => {
+const configureItemModelLoader = (loader: ItemGLTFLoader, renderer: unknown) => {
+  configureKtx2Support(loader, renderer)
   if (!itemDracoLoader) {
     itemDracoLoader = new DRACOLoader(loader.manager)
     itemDracoLoader.setDecoderPath('https://www.gstatic.com/draco/versioned/decoders/1.5.5/')
@@ -223,8 +225,12 @@ type LoadedItemGltf = GLTF & {
   nodes: Record<string, Object3D>
 }
 
-const useItemGltf = (url: string): LoadedItemGltf =>
-  useLoader(ItemGLTFLoader, url, configureItemModelLoader) as LoadedItemGltf
+const useItemGltf = (url: string): LoadedItemGltf => {
+  const renderer = useThree((state) => state.gl)
+  return useLoader(ItemGLTFLoader, url, (loader) =>
+    configureItemModelLoader(loader, renderer),
+  ) as LoadedItemGltf
+}
 
 type DeferredUnavailableCleanup = {
   consumers: number
@@ -413,13 +419,12 @@ function getPreviewMaterial(shading: RenderShading): Material {
 const PreviewModel = ({ node }: { node: ItemNode }) => {
   const shading = useViewer((s) => s.shading)
   const isExporting = useViewer((s) => s.isExporting)
+  const [w, h, d] = getScaledDimensions(node)
   // Loading placeholder — must never land in an exported GLB.
   if (isExporting) return null
   return (
-    <mesh material={getPreviewMaterial(shading)} position-y={node.asset.dimensions[1] / 2}>
-      <boxGeometry
-        args={[node.asset.dimensions[0], node.asset.dimensions[1], node.asset.dimensions[2]]}
-      />
+    <mesh material={getPreviewMaterial(shading)} position-y={h / 2}>
+      <boxGeometry args={[w, h, d]} />
     </mesh>
   )
 }
@@ -444,11 +449,6 @@ const ClearPreviewModel = ({ node }: { node: ItemNode }) => {
   )
 }
 
-const multiplyScales = (
-  a: [number, number, number],
-  b: [number, number, number],
-): [number, number, number] => [a[0] * b[0], a[1] * b[1], a[2] * b[2]]
-
 const ModelRenderer = ({ node, markSettled }: { node: ItemNode; markSettled: () => void }) => {
   const gltf = useItemGltf(resolveCdnUrl(node.asset.src) || '')
   const unavailable = getUnavailableItemAsset(gltf)
@@ -581,15 +581,17 @@ const LoadedModelRenderer = ({
   // Undo can unmount one item while another clone of the same asset still needs them.
   return (
     <>
-      <Clone
-        dispose={null}
-        object={scene}
-        position={node.asset.offset}
-        ref={ref}
-        rotation={node.asset.rotation}
-        scale={multiplyScales(node.asset.scale || [1, 1, 1], node.scale || [1, 1, 1])}
-        {...handlers}
-      />
+      <group scale={node.scale}>
+        <Clone
+          dispose={null}
+          object={scene}
+          position={node.asset.offset}
+          ref={ref}
+          rotation={node.asset.rotation}
+          scale={node.asset.scale || [1, 1, 1]}
+          {...handlers}
+        />
+      </group>
       {animations.length > 0 && (
         <ItemAnimation
           actions={actions}
diff --git a/packages/nodes/src/site/renderer.tsx b/packages/nodes/src/site/renderer.tsx
index 023f9533..e29bf72e 100644
--- a/packages/nodes/src/site/renderer.tsx
+++ b/packages/nodes/src/site/renderer.tsx
@@ -290,6 +290,7 @@ export const SiteRenderer = ({ node }: { node: SiteNode }) => {
           raycast={noopRaycast}
           receiveShadow
           rotation={[-Math.PI / 2, 0, 0]}
+          userData={{ pascalExport: 'strip' }}
         />
       )}
 
diff --git a/packages/viewer/src/components/viewer/glb-scene.tsx b/packages/viewer/src/components/viewer/glb-scene.tsx
index 7f64f622..d3b26f9f 100644
--- a/packages/viewer/src/components/viewer/glb-scene.tsx
+++ b/packages/viewer/src/components/viewer/glb-scene.tsx
@@ -525,7 +525,7 @@ export function GlbScene({
       _camBox.setFromObject(object)
     } else {
       bookmarkNode = rootNode
-      _camBox.setFromObject(gltf.scene)
+      _camBox.setFromObject(rootNode ?? gltf.scene)
     }
 
     const bookmark = (bookmarkNode?.userData as PascalExtras | undefined)?.camera
diff --git a/packages/viewer/src/hooks/use-gltf-ktx2.tsx b/packages/viewer/src/hooks/use-gltf-ktx2.tsx
index 000b8ff6..ff8b3eed 100644
--- a/packages/viewer/src/hooks/use-gltf-ktx2.tsx
+++ b/packages/viewer/src/hooks/use-gltf-ktx2.tsx
@@ -1,16 +1,13 @@
 import { useGLTF } from '@react-three/drei'
 import { useThree } from '@react-three/fiber'
 import { MeshoptDecoder } from 'three/examples/jsm/libs/meshopt_decoder.module.js'
-import { ensureKtx2Support, ktx2Loader } from '../lib/ktx2-loader'
+import { configureKtx2Support } from '../lib/ktx2-loader'
 
 const useGLTFKTX2 = (path: string): ReturnType<typeof useGLTF> => {
   const gl = useThree((state) => state.gl)
 
   return useGLTF(path, true, true, (loader) => {
-    if (ensureKtx2Support(gl)) {
-      // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      loader.setKTX2Loader(ktx2Loader as any)
-    }
+    configureKtx2Support(loader, gl)
     loader.setMeshoptDecoder(MeshoptDecoder)
   })
 }
diff --git a/packages/viewer/src/index.ts b/packages/viewer/src/index.ts
index b0752610..9a7e7165 100644
--- a/packages/viewer/src/index.ts
+++ b/packages/viewer/src/index.ts
@@ -69,7 +69,7 @@ export {
   collectIsolationSubtree,
   isIsolationActive,
 } from './lib/isolation'
-export { ensureKtx2Support } from './lib/ktx2-loader'
+export { configureKtx2Support, ensureKtx2Support } from './lib/ktx2-loader'
 export { GRID_LAYER, OVERLAY_LAYER, SCENE_LAYER, ZONE_LAYER } from './lib/layers'
 export {
   applyMaterialPresetToMaterials,
diff --git a/packages/viewer/src/lib/ktx2-loader.ts b/packages/viewer/src/lib/ktx2-loader.ts
index 0ef7d792..24dc0b2c 100644
--- a/packages/viewer/src/lib/ktx2-loader.ts
+++ b/packages/viewer/src/lib/ktx2-loader.ts
@@ -162,6 +162,15 @@ export function ensureKtx2Support(renderer: unknown): boolean {
   }
 }
 
+export function configureKtx2Support<T>(
+  loader: { setKTX2Loader: (ktx2: T) => unknown },
+  renderer: unknown,
+): boolean {
+  if (!ensureKtx2Support(renderer)) return false
+  loader.setKTX2Loader(ktx2Loader as unknown as T)
+  return true
+}
+
 export function isKtx2Url(url: string): boolean {
   return url.toLowerCase().endsWith('.ktx2')
 }