Wife found it on Pinterest, honestly looks like a cool idea. IMHO better than keeping a handgun or rifle in the open in a bedroom for self defense. Obiviously the only protection it provides is the hiding in plain sight, I would still use my safe to store the rest of my weapons.
They’re cool. If you’re handy you can easily make something similar for a reasonable cost. If you’re good with drywall you could even do a whole wall that would probably be even more stealthy.