My only comment would be on the regularity of the grid in the poor quarter. Slums/poor areas tend to ignore regular grids, even if they start with them. People construct buildings against building to save the cost of walls. Most everyone walks, so all streets congest and disappear in many cases. Even the idea of private land ownership is weak, so often public thoroughfares cut right through "property" lines. The main paths would all be radial from water sources, markets, and holy places, not grids.

-Rob A.