Re: Pike's "TV" in "The Cage"
A stage prop television set is probably much lighter than a real set, as skilled painters can make even balsa look like fine oak (and there's no guts). If the Pike TV was built, and didn't need to support a person's weight, they might have used the least expensive wood and internal frame construction possible.
It might have been something already in Desilu's warehouse from a film.
Curly: Moe, Larry, the cheese! Moe, Larry, the cheese! (Horses Collars, 1935)