Space Engineers and Empyrion let you do that and it’s very fun. Empyrion is more of a game, Space Engineers is more about engineering. In Empyrion we have a big capital ship as our base, it has a landing platform on the back with 2 fighter ships, and a vehicle bay and ramp in the belly with mining hovercraft. Everything is block based and there is a ton of freedom, we could stack 6 fighters on the back if we can get the landing gear to latch. Or make the landing platform bigger.