diff --git a/frontend/dcViewer.js b/frontend/dcViewer.js
index c417787..282eb22 100644
--- a/frontend/dcViewer.js
+++ b/frontend/dcViewer.js
@@ -319,9 +319,11 @@ let modelVersionHistoryLoading = false;
 let modelVersionUploading = false;
 let versionHistoryModal = null;
 let loadModelAsyncRef = null;
+let versionModelCounter = 0;
 let emptyWheelNavigationRestoreTimer = null;
 let lastSurfaceDollyFactor = null;
 let lastSurfaceDollyFactorAt = 0;
+const MODEL_LOAD_TIMEOUT_MS = 120000;
 const GUEST_TOOLBAR_ACTIONS = new Set(["measure", "section", "projection"]);
 const memoryStore = new Map(); // url -> ArrayBuffer
 const blobUrls = [];
@@ -4700,6 +4702,13 @@ const uploadBuffer = async (bytes, filename, options = {}) => {
 
 const getVersionKey = (version) => version?.versionId || `version-${version?.version || "unknown"}`;
 
+const makeVersionModelId = (version) => {
+  versionModelCounter += 1;
+  const rawKey = version?.versionId || version?.version || version?.originalFilename || versionModelCounter;
+  const safeKey = String(rawKey).replace(/[^a-z0-9_-]+/gi, "-").replace(/^-+|-+$/g, "") || "version";
+  return `model-version-${safeKey}-${versionModelCounter}`;
+};
+
 const getModelVersionIdentity = (entry = getPrimaryModelEntry()) => {
   const meta = entry?.meta || {};
   const direct = {
@@ -4896,13 +4905,18 @@ const openModelVersion = async (version) => {
     if (settings?.viewerSettings) {
       meta.viewerSettings = settings.viewerSettings;
     }
+    const previousModelId = previousEntry?.model?.id || null;
+    const nextModelId = makeVersionModelId(version);
+    if (previousModelId && transformStore[previousModelId]) {
+      transformStore[nextModelId] = safeClone(transformStore[previousModelId]);
+    }
     await loadModelAsyncRef({
       type: viewerType,
       url: viewerSrc,
       name: version.originalFilename || previousEntry?.name || "model",
       replace: true,
       preserveMeta: true,
-      id: previousEntry?.model?.id || "model",
+      id: nextModelId,
       meta,
     });
     modelVersionHistory = {
@@ -6093,6 +6107,7 @@ const initViewer = async () => {
         isMemory,
         name,
         replace,
+        requestedId: forcedId || null,
         url,
       });
       const xktDataSource = inferredType === "xkt"
@@ -6112,7 +6127,7 @@ const initViewer = async () => {
         dataSource: xktDataSource || gltfDataSource || lasDataSource || stlDataSource || undefined,
       });
 
-      const id = forcedId || (replace ? "model" : `model-${++modelCounter}`);
+      const requestedId = forcedId || (replace ? "model" : `model-${++modelCounter}`);
       let srcToLoad = url;
       if (inferredType === "obj" && typeof url === "string" && url.startsWith("memory:") && memoryStore.has(url)) {
         const blobUrl = URL.createObjectURL(new Blob([memoryStore.get(url)], { type: "text/plain" }));
@@ -6120,7 +6135,7 @@ const initViewer = async () => {
         srcToLoad = blobUrl;
       }
       const loadOpts = {
-        id,
+        id: requestedId,
         src: srcToLoad,
         edges: edges ?? (inferredType === "gltf" || inferredType === "las" ? false : toggleEdges.checked),
       };
@@ -6129,12 +6144,17 @@ const initViewer = async () => {
       if (inferredType === "stl") loadOpts.smoothNormals = true;
 
       const currentModel = currentLoader.load(loadOpts);
+      const id = currentModel?.id || requestedId;
+      if (id !== requestedId && transformStore[requestedId] && !transformStore[id]) {
+        transformStore[id] = safeClone(transformStore[requestedId]);
+      }
       sceneModels[id] = currentModel;
       modelTypes[id] = inferredType;
 
       currentModel.on("loaded", () => {
         reportViewerEvent("model-loaded", {
           id,
+          requestedId,
           inferredType,
           name,
           objectCount: Object.keys(viewer.scene.objects || {}).length,
@@ -6180,6 +6200,7 @@ const initViewer = async () => {
       currentModel.on("error", (err) => {
         reportViewerEvent("model-error", {
           id,
+          requestedId,
           inferredType,
           name,
           error: err?.message || String(err),
@@ -6225,8 +6246,24 @@ const initViewer = async () => {
       reject(new Error("Не удалось инициировать загрузку модели"));
       return;
     }
-    model.on("loaded", () => resolve(model));
-    model.on("error", (err) => reject(new Error(err?.message || err)));
+    let settled = false;
+    let timer = null;
+    const settle = (handler, value) => {
+      if (settled) return;
+      settled = true;
+      if (timer) window.clearTimeout(timer);
+      handler(value);
+    };
+    model.on("loaded", () => settle(resolve, model));
+    model.on("error", (err) => settle(reject, new Error(err?.message || err)));
+    if (!settled) {
+      timer = window.setTimeout(() => {
+        setLoading(false);
+        updateNavCubeVisibility();
+        updatePanelsVisibility();
+        settle(reject, new Error("Загрузка модели заняла слишком много времени"));
+      }, MODEL_LOAD_TIMEOUT_MS);
+    }
   });
   loadModelAsyncRef = loadModelAsync;
 
diff --git a/frontend/index.html b/frontend/index.html
index f802211..610794f 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -697,6 +697,6 @@
   <input id="fileInput" class="hidden" type="file"
          accept=".xkt,.glb,.gltf,.bim,.las,.laz,.obj,.stl">
 
-  <script type="module" src="/dcViewer.js?v=58"></script>
+  <script type="module" src="/dcViewer.js?v=59"></script>
 </body>
 </html>