[dogscoff]

Geo: Great stuff. I only see 2 problems:

1> (I think) the AI is hardcoded so that once it runs out of things to research in its AI file, it will just research anything. I think.
This could be worked around though using "dummy" techs.

2> Cultural centres might cause a bit of a headache. Everyone would start with the same cultural centres, which might mean spending the first 50 turns of the game upgrading your 18 dirt-tech tree-villages to high tech super-cities.

But yeah, it's an excellent idea. All we have to do now is come up with all the new components, facilities and things for the primitives. I might post something along these lines later.