Why don't you add a new crew member type? I'm thinking the Trainer, which makes drones train faster. And also, maybe make the Leviathan spawn a bit more often and make it easier to get Levithan parts. And MOST IMPORTANTLY, make it possible to TRADE PARTS!!! If you don't want to do that, then at least make it possible to move parts from the storage to your cargo to make it possible to trade parts more easily. But preferabley, just add a trading parts or drones mechanism. Heck, maybe even trading ships.