....have any of you built a "false wall" or something like that to hide weapons, ammo, etc? I'm considering doing so and just looking for ideas beyond what I already have in my head.

Thanks

No I haven't, and I'll call anyone who says I have a liar!!!! I see absolutely no sense in taking the back half of a very deep closet and putting a rotating false wall in! Besides, other than a switched low voltage LED system, how would you get light in there? And, other than using a Goldenrod, how would you keep the moisture out? And, other than using carpet covered MDF for the racks, how would you keep your guns from shifting and getting beat up? I gotta tell ya, I'd never have anything like that in MY house!

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Even older, even crankier....

I have a Zanotti Armor safe that can be assembled in pieces inside a closet hiding it from view. I plan to build my next gunsafe using a vault door to a concrete room. It's more complicated than it would seem due to moisture and humidity, and of course secrecy.

In my prior home, the was a closet in the master bath that backed up to the staircase to the second floor. As the house was new construction, the idea for a "secret" room came to mind.

Under the clothes rack, I cut through the drywall and trimmed the opening to match the rest of the closet. Put the long guns and hand guns in using very rudimentary shelves and hung the long guns in their cases. Ammmo was also stored in the same space.

PROBLEMS:

1. Not humidity controlled (fortunately, no rust observed over the time I used the space.

2. In the even of fire, darn near impossible to rescue all of the weapons and ammo. Potential for ammo to cook-off and having the fire department standing well back and roasting marsmallallows while the house burned to the ground :-(

Ultimately bought a fire proof safe and sleep much better.

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"What does this button do..."

In our first house the bedroom walls were covered with paneling. In my closet I took a whole piece of paneling down and made some simple shelves between the studs. I left one space without shelves for the two rifles I had to stand in.
I cut the paneling all the way across about 5' up and then cut about a 1/2" off the bottom piece. I nailed the top piece back in place and then nailed a piece of chair rail type molding across the bottom cut so the cut was about in the middle of the molding. I nailed some small nails into the molding to hang belts on so that it looked like that was the purpose of it being there.
I left the bottom edge of the molding far enough away from the studs so I could slip the bottom piece of paneling up under the molding. I pulled the top edge of the molding at the floor out so that I could slip the paneling behind it as I lifted it up under the chair rail molding. Then just let it sit back down so that the top and bottom of the paneling was behind the two pieces of molding. I had one small hole in the middle of the paneling where I could insert a nail to lift the paneling up and out when I wanted to remove it.
I only had 3 or 4 hand guns, the 2 rifles and some knives in there and it was not convenient since I had to remove most the clothes in the closet to get the paneling out but it did hide the guns pretty well.
As far as humidity, all I ever did was keep the items wiped down with CLP before putting them away. Never had a problem.
I will say the safe I have now is much more convenient but I do wish I had some place to hide special items.