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* The vanilla svn tech tree looks just like the A20 one with regards to the pair tech.
* The only thing I can reproduce is that trying to research a paired tech triggers the warn+return incorrectly in a running game.
If you want to start them as a minifaction first that is fine, but I think the plans are looking to make a full faction.
I could see a minifaction working by just having the encampment and then letting it be a combination civic center, market, and barracks in one thing. Just disable garrison and you can have the barter stuff on the left panel. Training queue look like: Bedouin Woman, Skirmisher dude, Camel Raider cav, Merchant. Can even have a basic tech tree (no phases). Just basic upgrades for the woman, skirmisher, camel cav, merchant, in that order. I think this would be more of a Bedouin/Berber minifaction rather than a Nabataean minifaction.