Build large bases uses a simple block building system. Most of the base structures can be fabricated in a fabricator provided early in the game. And exotic blocks can be bought from the sector market. Bases can be built to capture entire planets (how owning/capturing a planet will be done is still in planning phase)
Land Vehicle building - You can build your own land vehicles using provided blocks, add your engine, tyres and let it run on the planets.
Water Vehicles building - you can build your own water vehicles, boats, even bigger ships that can hold other ships.
Build Space Ships - you can build your own spaceships too, small ship to large ships.
Bases can be shared from inside the game itself and can be downloaded by other players to use for themselves or can be utilized to craft future missions.