This is a really low priority suggestion. It would be nice if GalCiv gave an option on the start of a new game to delete all old ship models (I know this is anathema to all you ship modders out there. But, my ships are just quick 'n dirty throw aways). I can always do this manually by going into each of the "ship" folders under the game folder. But, usually, I forget. There'd have to be suitable warnings to stop people from doing this without thinking about it. But, for me, it'd be nice.