Re: Space Station Jefferies
A bay this large would be difficult to pressurize. Perhaps the alcoves contain docking travel tubes. The original drawings do not indicate any type of door. Perhaps this was an early example of a semi-permiable force field. Any suggestions?
The original K-7 model
just had a black chasm. There was no illumination from within (dark flight deck as in "The Conscience of the King"?) but I'd say that AMT got that right with the model kit by suggesting a physical hangar door (once closed).
As for your Starbase 4 suggestion, I'd be inclined to look for inspiration from the orbital complex in TMP
or Space Station Regula
"The first duty of every Starfleet officer is to the truth" Jean-Luc Picard
"We can't solve problems by using the same kind of thinking we used when we created them." Albert Einstein