There's no reason why there can't be two (or more) different space dock designs; like there's more than one starship designs.

<Not that I'm suggesting you build more than one of them...or am I?>
The very point I mentioned upthread. But at the time my head was somewhere else. The idea I have now is something of a compromise: essentially a somewhat cylindrical enclosure enclosed all around except open at both ends--basically a tube.
I'm giving it further thought.
In the meantime here is my current concept in progress. I'm still working on the upper superstructure.
The upper part of the dock's framework is more than just an upper surface--it's an entire facility devoted to ship repair and maintenance. The orbital dock is almost like a small space station with facilities for personnel quarters, dock administration, storage and workshops. The detail seen on the end is repeated on the other end so that you have two auxiliary craft hangar bays. In this pic you can see the underside of the upper section with large windows all around looking down into the drydock. Just inside the open ends, above and below, you can make out the extendable cranes that also move along tracks (almost reaching in the middle) to reach any part of the ship.
I can think of lots of detail that could be added, but I'm trying to stay focused on this being a TOS era built miniature. The biggest challenge I can think of is adding spotlights on the inside. Some of the detail I'm adding physically could possibly just be painted on for the few seconds the miniature would appear onscreen.
Inserted into the episode I envision showing the
Enterprise entering or already berthed within the drydock rather than the standard opening of the
Enterprise orbiting the planet. Another quick shot could be when Commodore Stone is looking at his wall chart then it switches to the
Enterprise in drydock wherein Stone orders repair priority diverted to the
Enterprise.
I number the dydock
05 to visually suggest there are multiple like facilities orbiting the planet underlining the idea Starbase 11 is a major spaceport.