You offer some excellent advice to this conversation. While we have not ever built or created our own adult theater or glory hole booths in our home, we have two different friends who have done the same as you mention with great results.
The first friends have a fully finished basement that is locked to keep family out. Downstairs they have a dungeon room with several pieces of furnishings, and I would venture to say it is one of the best dungeons we have been inside. They have a large room with a stocked, self-serve bar, several beds, and a few couches set up as a general playroom. They have another room where they built a professional glory hole set up with four booths. All very nice, super clean, and only invited people can access the basement.
The second couple has an unfinished basement still with concrete floors and bulbs hanging from temporary fixtures. In the main room, they have a big screen tv showing VCR Porn and a few couches in the room. They also put up a 4 X 8 sheet of particle board that hangs from the rafters on the side of the room, and there are holes cut to serve as glory holes. It is an unfinished basement and not anything fancy at all, but it offers all the luxury of the big theaters.