You are going a lot into detail with a lot of mechanics but not sure if they are well thought out. I think concepts shouldn’t be that detailed because the exact numbers need testing.
I think we should see how the Malians work because they seem like they could be a test for American civilisations.
I thought about American concepts before Concepts for some popular Civilisations
This thread has the Aztecs and further down the Inca too.
Those concepts were made after the Beta but before the release of the game.
I would make them different today. Especially seeing that they are ok with making a civilisation that only has 1 generic unit.