I was actually toying with the idea of how one could make a Gurren Lagann style FS campaign the other day. You could start with some people on a nearly-primitive earth digging up an old fighter that once belonged to Alpha 1. Having typed that though, it might be more appropriate to find it in space.
Anyhow you find this old fighter and start fighting back against the Shivans, who have been fighting humanity as long as anyone can remember and as far back as any records show. You take on the title Alpha 1, and it is revealed that there have been countless Alpha 1s going all the way back to the Great War, and a never ending cycle of Terrans rising up to fight the Shivans only to be beaten to the brink of extinction.
With each cycle, the current Alpha 1 does more, fights harder, and further amplifies the legend. Eventually this escalates to you singlehandedly eradicating all the Shivans and saving the day, etc.
I was thinking it would be cool to retexture whatever ships end up getting used to make them look more... stylish than realistic. All the Shivan ships would have to have massive sharp teeth painted on them, for instance. It would also be fun to redo some of the pivotal missions from FS1 and 2 in the style of this campaign: as if someone were looking back on the events from thousands of years in the future. That is to say, what we've played is what really happened and this would be the over-the-top, embellished story handed down for hundreds of generations. (As if 'Good Luck' isn't epic enough already!)
Yeah, just thought I'd mention that. It's late, that might not be as clear as it seems to me. Maybe I should make a full thread about it...