Exterior drawing of city

Below I have drawn up some ideas of how roughly the city could look like, and then from my drawing I began modelling in Maya to get a 3D idea of how it would look.

I want the city to have a very claustrophobic feel to it with all the building very close together, but the industrial side to it. I.e. warehouse, gas silos, chimneys, etc…

This what done in maya from the sketches.