Zyxpsilon's mod on XWorlds or one of the older LotR mods maybe(?)
The game is easy to mod in some ways, and harder to in others, if AI building looks hard at first then check out the number of other ways to make usable mods.
Many other files are "human readable" iirc , therefor much can be modded via those files alone, and then there are the tiles themselves which are very modifiable.
The game itself has a comparatively small size, but mods do not have to be small.
=)
Posted 21-Jun-09 07:57 by Cor'e =)