I have an idea, but cant program it. It is solar satelite: There would be a "base station" -(like mirror colecting power from solar satelite on earth) like Your factory, but cant go in, when You send "solar satelite" in rocket, there would be build a "collector" -(factory) in "base station", with solar panels and place for next "collector" - (You recursive mod), so ever time You send "solar satelite" then in "base station" is build recursivly another "collector". If You are interested or do not undertand my idea (I write a bit chaoticly), I can try to explain it beater. PS for sending paarts into space can use (https://mods.factorio.com/mods/LordKTor/SpaceMod)

That should actually be very easy to mod in even without any scripting, if you change up the mechanics a bit. You know how regular satellites give you white science packs? Mod in a solar satellite that gives you a collector building instead.

The collector building simply generates a fixed amount of power wherever you place it, say 100 MW. So for every solar satellite you launch, you get a new collector building.

Sorry for long and not fully understandable language, but please read all, and send Your opinion and sugestions.
I would need a lot of tieme to understand thise mods, and reconfigutate them, I can't even mod Your mod to get diferent size of Factory (tryed in layout, and updates, but still got only my F4, which is the copy of F3 made from F3 codes).
In Your proposal every satelite lunch give a new building (no enter, solar power inside-no day/night?, no previe-not needed, new building look on map- for now borrowed like from Bio Industries -"Bio Solar farm"), I was proposing recuring for saving of place (one place on map to collect power from all new satellite) but You are meaby right with building for very satelite, than you can place it wherever, in separate map locationn to reate separate energy centers.
Or meaby both ideas, so you get new building and can place it on map or in other collector - so You get collector and decizion to place it on the map or in another collector?
But to put it inn annother collector you would need to be able to go inside one like to factory
or "collector building center" like factory with some surface and in it You place collectors from satelitet lunch.