Hy,
unless there is no sdk (software development kit) you wont be able to create games with OT yet. OT is an earth based universe now. Other celestial bodies are planned, but probably you have to select them before starting OT. I dont know if it will ever become a neatless solar system. Distances are very high, but maybe its possible with switching the reference systems.
The engine could also use procedural generated terrain. But you dont have the possibility to do this now. Nowadays you need terrain files which are parted.
Game mechanics will be developed in the future. Probably this will also include building objects.
Unfortunately i have to say, that your idea is not unique. Others had this idea too. It seems that the first impression of OT is always "wow, how cool would it be to have [insert obvious stuff here like mmo, space fighter, building]!?"
Many idea suppliers dont care about the developers. These people who shall realize the idea. Developers often have their own visions to realize. There is often no need for external ideas. And no time of course;) So actually there are two chances for you, to get this real:
1.) Learn game developing and make this game after OT released a development kit
2.) Wait for game developers who create games similar to your idea
I'm no OT dev, so maybe i'm not right in some facts.