Hey! just some small feedback:
laboratories are missing description,it's pretty obvious that they give 50% research but still.
I haven't found a way to build "cure for smallpox" wonder... what am i missing?
I think civ-specific units should be able to be upgraded, was playing a game with the chinese I build like 100 han swordsmen and won the war, but then could not upgrade them anymore and ended up disbanding them all later

for example, also, i'm playing at the romans, and I'm in the late industrial era and can still build stuff like camels or something that have stats atk of 2 haha. Maybe that should be fixed.
but still, pretyt awesome mod, thanks!