It is probably possible because I will build a simplified version of every building in the city, and be able to remove parts as needed. Very likely, most of the time I
won't need this in the background, but by doing this I can do some shots of the city as a whole, or overlooking the city; some scenes could be on the top of towers, allowing the rest to be in the background rather than keeping the camera aimed toward the sky.
this is a neat idea but i don't need it as my comp will shred any build.
Well, potentially the entire city at once, with all details, would threaten surpassing the brick limit. I would also like to be able to have actors who might not be able to operate properly otherwise.

And of course, I don't know any of this for sure. I've never done anything on this sort of scale, and this could quite possibly turn out as another mostly unfinished project. Likely not, as it has much variety and usefulness for me.