So, this is very cool, even if you’ve never worked with a 3D model in your life, and never want to (but why would you never want to?): 3dfilter is Google for 3D models and textures. There are actually a surprising number of free model “warehouses” online, including one from Google. 3dfilter searches them all at once and presents the results clearly. It’s pretty amazing what you can find.
And, uh, I’m not completely sure, but I think you might be able to assemble all of Manhattan from the results here.
So, it’s confirmed: the tools exist for a Garage Kubrick to ply his trade. The only question: Where is he? (Be careful: That link goes back to an old 2004 post about Sky Captain and the World of Tomorrow. It might give you media vertigo.)