You're right, there are two separate slum districts. The left-hand one shows my first experiments, and the right hand one my later experiments. My brother advised me to try and make it look more sprawly, and so that is what I tried to do. I think the second is probably better, but it is also harder to work out the architecture that is being depicted. I'm going tobsuggest to Shadire that the separate styles is due to different racial/ethnic populations, or different historical developments or somesuch.
Thanks for the praise, Soixante.
THW
Edit: oh, also, just to clarify
--The different coloured roofs on the right-hand slums are meant to be simple cloth awnings, to reflect the poverty of the neighbourhood.
--There are still a few neighbourhoods that need doors and windows. They'll probably show up in the next update.