Good work on the Mod. Found a few things to consider.
Played as USA random nations Fought the Iriquois, my infantry looked like Germans with sub machine guns the Iriquios had the American infantry.
I liked the Huey, you can fill them with 2 unis and airlift them for a total of 3 units airlifted.
The Huey disappears after the gunship comes along. They are still handy to have as transports might consider keeping them around in the unit list?
Air units get their initial exp when built but get no combat exp, I never had one air unit promotion come along other then when I first made them.
Cant remember but there was one wonder that was obsolete with a tech that came before the tech to build the wonder.
Good mod keep up the great work. None of these issues effected the game.