I would love to play on this, this really does sound like a great idea!
If you need any roads or starting structures, props, the like, I've got a save that you could use that contains all the work for Vaux's City RPG (it was decided that the mod was more important than a server housing the mod)
Roads come in various sizes:
Avenue- 98x64 (4 lanes + sidewalk)
Road- 64x64 (2 lanes + sidewalk)
Street - 32x32 (2 lanes + small sidewalk)
Backstreet - 16x16 (1 lane)
Alleys - 32x32 or 16x16 (contains debris, trash, etc)
Dirt roads - 16x16 wide (grass connects with terrain)
There are a lot of other things I've got that may be helpful, it's all high detail (a straight avenue is roughly 100 bricks). If you're interested, give me a PM. I'll more than likely be busy this afternoon but I'd love to show you the file provided we both have time