What resolution textures are these? If they're all unique, I doubt this would ever fly for todays production. A lot of what you're after could be achieved with proper world textures and decals. As well, normals and spec would help out a bit.
I think we'll let adam talk for himself. :) It's just trying to figure out the end game for the piece. If you are trying to render out a scene for a portfolio for movies or cinematics then high res textures like this might be ok, but then he might as well go in there and sculpt the buildings as well, if it's geared more…