Regarding your mod, I had some fun with it yesterday.
Yes, the Blacked Civ is kinda op lol but since I haven't played Civ in a long while, it came in handy.
In any case, I wouldn't mind keeping it OP though. If feasible/if that doesn't imply considerable additional effort, maybe there could be a balanced and an OP versions?
Which other features are you planning on implementing? It's unfortunate that the diplomacy menu is just a grey screen though :/ A moving scene like the vanilla Civs is impossible to make but made it could feature just a still image? I think I've seen custom Civs with that.
Other tips would be for the units to be black (and the female ones white/blonde lol).
Your custom buildings were a nice touch as well! Would it be possible to replace the vanilla buildings portrait as well?
One other feature would be to customize the vanilla CIVs to just display IR related stuff; at least the one's with males, maybe just replace them with some girls of said nationality, for example.
Sorry for the long text, I'm aware that all of this isn't that simple to accomplish and that it takes time and effort. I don't know the first thing about modding but maybe I'll google around and find out how to make some of this stuff.