The AI and PER is in the mail. Happy Hunting! I may make a few scenarios for the campaign contest but that's a remote possibility. For the time being, here are a few facts about the CTY files particularly Metropolis IV and III.CTY:
Farms: Squares 0 - 13
Houses: Squares 13 - 14/15 - 16
3x3 Military Buildings: Squares 17 - 27
Towers: Squares 19 - 28
Wonder: Squares 0 - 13 (Inside Farmland)
So if you are thinking of using the CTY files and putting in a wall, I would add it at a perimeter of 30 squares form the TC. Notice, that structures can overlap in CTY. This is to allow for a little randomness in placement.
Devyn