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Randy
Thanks for the kind words.
I think the basic idea could be easily modified to be a safe room door. It will absolutely support the weight of steel or cement.
Lots of folks below have suggested ideas for “hidden latches”.
As to a reliable, easy, convenient, and undetectable lock mechanism: My favorite idea is a variation of the magnetic latches they sell in the baby proofing section. A strong latch is located behind a panel. This latch is released by placing a powerful magnet on the outside of the panel. In practice this would be a “paperweight” that is sitting on the shelf. By placing this paperweight in the right spot on the shelf, the latch is released, and the door can be opened and closed freely. If the weight is moved, the door latches when closed. To work the latch must have a slight bit of free play, so I would include a light magnetic stop to keep the door from being able to rattle against the latch ( not that 300 pound doors rattle much) and it would also keep the door in position to allow smooth release of the latch( an almost balanced mechanism with strong magnet mounted on pull part.
I think I might have to try this:)
could be used as a kind of poor man's panic room. You could keep some water, a charged cell phone and whatever else you deem necessary. Of course you would need to sound proof the storage room somewhat if you want to be able to call for help on the cell phone. I don't think reception would be a problem in this case as you said it's under the garage, but you could run some kind of wire out to be able to increase your bars.
But hey man, smooth welding and setup. You rock!
I'll build something like this one day...
It could have been more subtile if the shelfs on the secret doors had been placed on the same level than the real shelves.