The whole idea combining to be stronger really kinda falls apart when you really think about it. From an engineering point of view. You end up with massive redundancy eating into space and power. 5 engines, 5 life support systems, 5 power cores, 5 weapon systems, ect, ect. Not to mention the needed equipment to convert…
Bah, this is silly. We all know both sides would loose to the ships in Babylon 5. A single beam from a Whitestar would slice both a Star Destroyer and a Sovereign in half with one shot. And do it while doing a looping roll, for extra style points. :D And who needs either Klingons or Sith. When you got the Narn on your side?