These are from the FASA RPG maps for their old Star Trek
RPG. They were heavily influenced by the FJ work.
To my knowledge, FJ was the first to suggest these were scanners. Personally, I'm all for it. I love the idea that these round lights are sensors. In fact, in my deckplans project, all
of the round portholes on the ship are windows for sensors and scanners.
However, nowhere in the show, or, as far as I know, MJ's notes, was any
identification made for these three lights. I prefer scanners, myself, but TPTB at TOS/r seemed to prefer the idea of them being windows.
In either case, seems to me that Donny
is trying to model the sets we actually saw on-screen, so I imagine that what lays behind those three circles is entirely out of the scope of what he's trying to do.