I was working on something like this but, it was to be more of an alternate history/future mod. Races were to be the US, Soviet Union, Nazi's, Japan, China, EU or UN, and maybe an Arab/Muslim civ or race. I have become distracted lately however with another project where I have added the Zerg as a playable race. The ships would be edited versions of several ship sets that have already been released.
"Tho' much is taken, much abides; and though we are not now that strength which in old days moved Earth and Heaven; that which we are, we are; One equal temper of heroic hearts, made weak by time and fate, but strong in will." -Tennyson