hmm...been doing something the same recently. I've been (in Wings 3d) taking primitives, extruding all faces slightly, and also playing with the Mirror command (if you don't select a face, it mirrors all of them. Real quick way to make complex buildings..;). The map looks good, maybe just build up buildings of different heights, maybe a gondola or 2, bridge of Sighs,St. Mark's square, Rialto bridge, etc.?..;) You can always bring the focus to a lower altitude to save yourself some work. Depends on where you want to go with it..

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)