ImperialII high res 3d model (Polygon mesh 3D model) is available on CGTrader for $70. Original author: ridergear. Specs: 10000 polys, 10000 verts.
RFA (Autodesk Revit, filesize: 6.35 MB), OBJ (OBJ, filesize: 6.35 MB), MA (Autodesk Maya, filesize: 6.35 MB), DAE (Collada, filesize: 6.35 MB)