My superworld and other group had been begging me to run a scifi setting ala the tropes and we have used Worlds beyond as a base system it has some minor flaws, but very workable. I downloaded a ship build system here and though downloaded have not heard back from anyone. It works for anysystem, Trek and big ships are interesting. Anyway, the first rule is KISS, " Keep it simple stupid", in this case stupid means the system. A simple system can be built upon unlike the other systems out there, like high guard and the trek systems, the system gets overly complicated and begins to limit. Your "SDC" system for weapons is interesting, but I would simply state that for some reason hand held beams dont work, the tech cant be developed etc, or the society has severe penalties for their use etc. For ships there are a couple ideas. In the game I am running they obtained a ship that was found derelict. It was a mess, but servicible. Now, they discovered the ship may have been used as apirate vessel and are on the run. They are trying to figure why the ship was abandoned, and discovering the ship itself seems to have ...an agenda, lol. In The the cool game FTL:2448 the example party wins a crappy ship in a card game. Start simple and build.