Do you have any questions about modifying the game? What will you need to do what you want to? What are the best techniques? Discuss Modifications, Map Making, AI scripting and Random Map Scripting here.
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I've just tried with your newest version, and can't reproduce the problem. Maybe try to clear your cache.
it seems that the AI thinks the building is not yet finished (it happened in the past when there was a rounding problem between the hitpoints in the simulation and the one transfered to the AI. But that should be fixed now).
Am I missing something or couldn't you just do what I always end up doing these days ... setting the team of yourself and the AI to the same team (ie: Team 1) - I normally end up doing this w/ 3 AIs (but mainly for research purposes as I am studying dynamic planning). But I think what I am waiting for is the DiplomacyManager to improve (so that it will give you a reason to end up in war and begin fighting - but also shift to Neutral / Ally).
So I think you could just set yourself and AI to same team and in the Options panel select "Teams Locked" (instead of default Last Man Standing) and you will be in co-op w/ AI.
It is not planned to add more factions/civs to the main game.
Although there are mods which include more factions and there are tons of post suggestin more factions, like the ones you said.
Checkout this subforum https://wildfiregames.com/forum/index.php?/forum/18-game-modification/ it may give you an idea