Let me think about it. I don't want to break the progression order too much by giving you access to tesla turrets and railguns before you have the research for it, but I would only be giving you a finite number of them and no technology to make more. Could make for some cool demolisher hunting where you only have the big turrets and no way to make more ammo.
It might not be all that technically simple as well, as technically this is a planet surface rather than a space platform. At best I might just have to let you harvest it for parts and you build it yourself.
The free energy would have to go at the very least though.
