Re: TOS's largest one time prop.
Wasn't Apollo's temple from Who Mourns for Adonais? fairly large as well?
Been wondering about this. I'd imagine that Apollo's temple, picnic table, planters, and small court yard weren't built from scratch, instead the various pieces were retrieved from studio storage (or a Hollywood supplier) and assembled on the sound stage.
Roll out a little fake grass, and you're done.
It's easy to support someones beliefs if they are identical to your own.
Tolerating beliefs that you don't personal embrace, or even fully understand, is harder.