... so basically ur looking for the ability to build individual industries, outside of colonies.
which, I like a lot. I always wanted to be able to find hidden tech mining facilities operated by other factions or a hidden population & infrastructure for refugees fled from the core living on that planet or a hidden farming industry of luddic pathers whose yeoman farmer (basically medieval) lifestyle makes them invisible to passing ships short of a survey, or a waystation (I know thats already in a mod) station with a single heavy industry industry as well as a passive demand for fuel so it can stockpile guns ships supplies & fuel for passing fleets to buy off of it without needing to rely on planets' unreliable stocks with no pesky defensive fleets to dissuade potential customers away from buying there just bc of petty matters like "being an enemy". Or a hidden commerce industry set to freeport that sells all kinds of random, high quality goods with a substantial tariff/markup
i mean, the hidden pirate base mechanic is basically this for the military base industry
edit: OH AND, this but with some (nonplayer) colonies having hidden industries would pair really well with lore stuff like tritach's hidden AI & techmining facilities or Nomios having a hidden commerce industry (paired with its cryfacility that produces organs), or the pirate colony in Sindria having a hidden military base to go along with it being unofficially allied with that system's revolutionary faction
In a manner of speaking, yes.
I view those large-scale station colonies as holdovers from the Domain era, the player shouldn't really be able to build them on that scale. Especially since they end up as 100% hazard colonies that are flat out better than most of the planets you can find, and why bother colonizing ground-side when you can just make a huge space station that does the same thing but better?
As for the station commanders, you could probably just make them equivalent to Gamma Cores (just without the chance of ticking off the Hegemony) for simplicity.
Now there
would need to be some limiting factors to how many you can have in total so you can't just spawn them everywhere, such as geographically (only built in systems you've claimed and around the resource for mining bases, military ones could be built elswhere but don't claim the system, etc) and management (perhaps you can only own twice as many as the maximum amount of Administrators you can own in total).