Its also something I have wanted to do, but I have had a hard time coming up with good ways of group them with unique bonuses... you are giving some good ideas
similarly here! Either one of you can PM me with how to set some of this stuff up
Tribals I know Gauls/Brits and they already have something similar... I would think Germans could be put in that category? But the way the base game added germans they are quite different in their structures... so I didn't want to change that yet. Would Iber be in the tribal group? There are 16 civs, about 4 groups of 4 would be nice