It seems like the mod is very unstable and it will crash when you do something processor intensive (i.e. loading a game). Another problem I've seen is the fact that you can't puppet a country without the game automatically annexing them. I don't know if this supposed to be a mechanic of the mod or a bug, but here it is.
Also, for the mod dev, it would be nice if you can add Equestria's tank/plane models/names into Lunar Empire's too. It's kinda weird to have generic tanks after a certain point when Equestria has unique name.