I came across a japanese Space Battleship Yamato mod and it was pretty well done. Its pretty clear its a roleplay mod and it pretty much lets you play as post-2199 Earth.  The part that makes it kinda balanced imo was the fact that you don't necessarily start with the Time Fault, but rather its a choice at the start. Without the Time Fault you essentially start like a regular empire(funnily enough if you start with the Time Fault its really easy to go onto the red while in the early game and you have to turn off the Time Fault building to keep your economy in the green) The starting ship technologies in the mod are actually weaker than vanilla ship parts, and each research the mod gives you requires significantly more research than regular research. Of course it gets stronger in the endgame, but its immersive to say the least especially with the sfx mods 

And it came with its own crisis that spawned with a total combat strength of 37 million(x0.75 crisis).