There is now a Build ur own ship mod
Behold someone's space castle. This needs to be vanilla
This does need to be vanilla, you should also be able to place ship decor parts like engines, and other things to make your ship pretty and look vanilla.
Also I was watching Omni stream himself coding some stuff for starbound, so was a bunch of other people. When the stream ended we all went on a server, built a bunker and messed around. Good times