It struck me the other day that sinking little mines complete with little ore wains all over the place doesn't seem a very Mesoamerican thing to do. To start with, wains are of limited use when you don't have wheels.
So, I was thinking to use the little hutlets from the Rood and Dragon instead, if nobody has a better suggestion. If I feel really ambitious, I may even take the trouble to rename them into hamlets.
Also, I wonder if anyone can think of a fitting set of fortress gfx. Set and set - a single one would be enough, since it could be used for all eras, and barricades are disabed anyway.