To be honest, I'd much rather have something tangible before I talk about my little project.
My thoughts are, however, that my somewhat ambitious project would be something of an Ecumenopolis, or at least a fantasy world in the process of becoming one. I've got a whole story in the works for it and perhaps an RPG setting, but nothing drawn yet; I'm kinda at a loss of how to go about making a world view map of a macropolis. Perhaps do as any other map and layer cities after the major geography is fleshed out?