If i understood correctly, the project is in the spirit of the former community worldbuilding projects, so it's showing the diversity of all the influences, styles and ideas of the whole (or a representative part of) the CG. Everyone is mapping it's own district in the way she/he likes, but i think there'll be a common lightsource, so shadows can be somewhat coherent. Btw. welcome to the sout-western parts djan! Now i feel less alone down there.
Edit: Also somewhere in this monstrosity of a thread, i thin John mentioned that it might be a good idea if everyone would stick to a top down view, but for me personally it wouldn't be a problem, if some districts are iso and some top-down, like with the regions on the Guildworld
Edit2: For the part of the city walls, it would be great if they are clearly on one district, otherwise it'll become a bit complicated. From the experience with the last project, it is always helpful to be in contact with the direct neighbous to arrange these things around the "borders"