Here is my first attempt (though been playing with this for quite some time).
I'm planning to make three types: Poor, Middle, and Rich. Poor is here, and it will be base to extrapolate to higher classes.
My main problem was to find any good references, and find good proportions. Both unresolved I think ;p.
Optimization and so on is not an issue at this point. Just need some advice on achieving good look on multi level building, without clean separation of floors.



Replies
You might also find some good stuff here: http://freetextures.3dtotal.com
That's good question. Because I'm aiming at something between Babylon/Ancient Egypt and about 8-11 century of our era. I want to give it more Fantasy/Hyborian Feel of Stygia/Acheron/Turan.
Thus I don't want it to be super realistic and/or historically accurate.