My thought is, to break it up a little bit… I figure space combat would feel kind of like battleships, because your trying to knockout sensors and other systems by blowing up their components…
Instead of it being a huge map landing on a map, maybe shuttle pods that get spawned on the map. and you can return to your main ship from that… teleporters and stuff…
The biggest thing I see that maybe the hardest part to get a more or less solid concept is, traveling between planets, or locations, how its handled and stuff… Even if its just a travel menu, with times to different locations and known potentials(Space slugs, pirates, anti-matter mines) during the trip and options to do other things or seek other things…
Tech would pretty much be handled the way it is now. It maybe powerful and out there, but without sufficient supply or knowledge, or familiarity that shiny new toys not that great and shiny. It would require a bunch of new skills but I think starting small, and getting far more ambitious later is the plan.
I already see the system in place for ground combat, adding and changing around the zombies to be different creatures, different terrain features for different planets… Its all basically here already…