I am not taking on this commission, but I think it would help if you made a crude map of the general layout of the town. Think land features and a general idea of the shapes and sizes of the districts. It looks like you have the city pretty much thought out, so it would help the cartographer a lot (and it would make sure you get what you want).
Also, PM's only work after you made 5 posts on this forum. So either make 5 posts or leave an e-mail address for people to contact you.