Timo wrote:

"I'm not sure of the virtues of dispersing the transporter rooms. "Enemy Within" teaches us the system has extremely centralized resources."
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Not exactly. Scotty is again quite a drama queen stating that it would take at least a week to repair the circuits and then suddenly comes up with the idea of somehow using the impulse engines to power the transporter (well, in "Mudd's Women" battery power seemed sufficient).
Timo wrote:

"Did we ever really learn what the door opposite the transporter room doors leads into? Is a mirrored transporter room ruled out?"
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I just remember that in "Day of the Dove" the main door to this holding area / briefing room is opposite of the transporter room set. If you take the original studio set into account, a mirrored transporter room is ruled out, as it would stick out of the wall where the ladder is.
Interestingly, a transporter room was behind this studio set wall (the one with the multipurpose, semi-transparent wall panel) in WNMHGB but this was only the different pilot episode corridor and an open space opposite to it...
Bob