Well , I just wanted to say we have all seen this before, pal
Star Trek vs Star Wars
Star Trek vs Babylon 5
Star Wars vs Babylon 5 ...
The problem is ... They are not playing at the same time ( Star Trek is further in the furure than Bab5, and Star Wars shows events that happened a LONG time ago in a galaxy FAR FAR away ) not playing in the same universe ( history was different "on the way" to the future ) and not with the same physical reality.
What do you want to do ? You cannot tell a trustworthy background story, or develop a really good storyline with historical background, coz whatever you come up with contradicts with "historical facts" of at least one space opera. Everything would have to stay uncomfortably ... simple.
The only thing you can do with your Empire vs Centauri thing is to let imperial vessels fight against centauri vessels... but this would get boring pretty fast.
I just think this is a dead end, and I fear there won't be as much fun as you want to have out of it.
Personally, I will ignore it.
"Either we commit ourselfs to this completely, or we don't do it."
-- John Sheridan , No surrender No retreat
If you do 20 things simultaneously, you don't do even one of them properly. Just like those heroes out there who work on 8 FS2 projects at the same time, profoundly lacking the ability to CONCENTRATE. Well , some of them just do it so they can jerk off at the sight of a dozen project ribbons in their profile *lol*
Well, you are working on Star Wars as well..
You will be happier if you'd do B5only and StarWarsonly stuff I predict.
I think there is place enough for all universes , I love B5, and I enjoy Star Wars , looking forward to StarWars mod releases too..... but I still hope they don't get in each others way.