R. Star wrote:
The All the Ages Mod for BOTF does this pretty nicely. It starts off with the NX-class and you can go all the way to the Sovereign, Intrepid and what not.
Unfortunately, that mod suffers from a fundamental BotF flaw. The research is too slow and the galaxy map too small. It's almost impossible to reach Sovereign class, because by that time game will won already. I usually won the game with UFP by the time I had Excelsior class and maybe Ambassador.