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Where can you change how much they cost to build?
data/descr_cultures.txt, search for "fort_cost", it is culture-specific.
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Is it possible to have each culture build uniqe forts?
There are multiple settlement plans in the "settlement_plans" folder, one for each culture, so I assume yes.
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How involved is it to change their shape and how many towers they have?
Quite involved I think. See webbird's new fort HERE and HERE.
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Can you mod things like the range and rate of fire of a tower on a fort?
Don't think so, but then again I could be missing sth... Webbird would be the one to ask.
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Is it possible to have units spawn as part of a fort? I'm wondering if I could make a fort that has onagers in it for instance.
Don't think so.