This is the space game you're looking for.

Station building
Ship Building (not like space engineers but you can build and customize based on frames)
RPG Quests - pretty decent story lines
Sandbox - you can do what you want when you want
Each DLC is an improvement on the game

After 500 hours into this game I can say that this is a fantastic game.

One "downside" to the game is that it will take a long time to get some things done. For example if you have the materials, some station modules can take 15 minutes to build each.

The game also loses a lot of FPS in the late game as more and more things need to be calculated. You can mitigate this a little bit by reducing the graphics slightly. I turned off volumetric fog and saved 10 fps. The game is very CPU heavy.

Lastly, there's a ton of mods for you to enjoy once you get your fill on vanilla. I suggest though that you play vanilla first (with the DLCs). There's also a fantastic star wars mod.

This is the space game you're looking for. Station building Ship Building (not like space engineers but you can build and customize based on frames) RPG Quests - pretty decent story lines Sandbox - you can do what you want when you want Each DLC is an improvement on the game After 500 hours into this game I can say that this is a fantastic game. One "downside" to the game is that it will take a long time to get some things done. For example if you have the materials, some station modules can take 15 minutes to build each. The game also loses a lot of FPS in the late game as more and more things need to be calculated. You can mitigate this a little bit by reducing the graphics slightly. I turned off volumetric fog and saved 10 fps. The game is very CPU heavy. Lastly, there's a ton of mods for you to enjoy once you get your fill on vanilla. I suggest though that you play vanilla first (with the DLCs). There's also a fantastic star wars mod.