Re: the ceiling of Kirk`s Bridge - transparent?
But then again, there is this shot from Is There In Truth No Beauty?. Obviously, where the bridge segment tops meet to form the "half-dome", the ceiling then shoots 90 degrees upward in a cylindrical fashion. This makes my version non-canon.
Oops...I overlooked this one. However, in contrast to the one from the pilot it rather looks like an added (unfolded "Forbidden Planet" style?) structure than permanently attached, but that's probably owed to the hectic of production, so we might not need to take it literally, necessarily.
"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