a game that can bee completely modded by the user to be what they want add a little ST Armada into the mix there too, but i think you should have like a complete file loader right in the game that unwraps intire models .etc and have everything seperate with a total load fature for tc's but from that you got the idea if it would not be too hard make the ships customizable while in the game, you could research a new engine for a star destroyer to make it faster in rs for example, but a sd built before the research would need to be upgraded for the additional speed, and on a diff topic control of each shipyard on a planet where you can be fixing two ships and building two if you have four yards