There's a game about building, roleplay and sandbox in space. It's called Space Engineers!
From Star Trek to the AT-AT of General Veers...
You shall find everything for every sci-fi movie fan, including you!
On its workshop, there's everything for you too!
(Excuse my rhyming)
Trailers:
https://www.youtube.com/watch?v=vDwolUCSAmQ
https://www.youtube.com/watch?v=YWZQj-1oK8k
I hope you will enjoy playing it. :D