I;m not sure if iy's possible but here's my idea.
1. That there be a home system, but with no Civilization Capitol.
2. Have the player start out with a battleship that would serve as a mobile capitol.
3. Have the ship be strong, but if it goes "blooie" as the GNN robot says, you loose.
4. Have the ship confer some mega bonuses to whatever planet it orbits,
I would make the mod myself, but sadly the whole thing is a bit beyond me.
If somone would make it it'd be really cool to say the least and I would be eternally greatful