Bill,
Pretty cool,
I don't know why? But it reminds me of the Bruce Willis movie RED where he meets up with the paranoid Marvin (John Malkovich). When Marvin opens the trunk on the junk car and goes down to his secret lair.

I prefer the out of sight out of mind angle. I posted here about a Bunker I built in my basement. You'd need a Torch to get in.... IF you find it:
https://www.milsurps.com/showthread.php?t=72607

Years back we did a new home for a Ex pro ballplayer. 8' solid core interior doors we call 'Herman Munsters'. Also called 2 maners, because it takes 2 men to haul them around.
They had 2 Bi-fold doors to what you'd think was just a walk in closest.
When opened and after you were shown where and how to pull on the pre-finished shelving a Murphy style bed (without mattress) pulled down to reveal his hidden arms room.
All the joints were hidden by the upright shelving stiles. The fixed shelves had attached shoe boxes... etc sitting on them. Those shelves became the base when pulled down.
It was pretty nifty.... but word got around the job sites pretty quickly about it.