I built a two gun E cat safe out of RSJ. It had a 5 lever mortice dead lock welded into the top on a plate, that locked it and at the bottom end a plate was welded to it, with long bolts that could be bolted through a floor joist or set into a concrete floor. a small hole for a wall fitted bolt completed the securing of it.
From memory it was 6 mil thick. Thats the minimum ( then ) Firearms had to be lowered into it from the top so it was a bit of a pain. But it cost me FA to make and passed vetting.
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