I was thinking it would be really nice to pull from different styles in the ship designer. In major part for custom civs but also for late game with original civilizations. As the player conquers other civilizations, in part or in whole, or brings species in through trade and diplomacy, it's a natural occurrence that aspects of those civilizations are integrated into the host civilization.

There could be some interesting things created if Terran warships integrated Xeloxi tech as a Terran space pirate group. I could see a few other good combinations. 

Long story short, is there anyway to access other ship styles in the builder when one is already part of the design?