That sounds like a fun idea, but I think the best idea is to model it on older shows like the original Galactica. Unless you wanted to go into the prequels - then I'd suggest a '90s show like Stargate or Deep Space 9.

So for an opening sequence, remix an upbeat piece of music (like the credits from Star Wars), start with some ships flying and action scenes with anonymous characters. Then you'll introduce each actor with a shot of their character smiling, wind down with some action shots of the main characters. Maybe I'll make some mockups or something.