Or get a safe that is the width and depth you want, cross-check it with available steel SHS eg
https://steelandtube.co.nz/catalogue...-product-guide
which has SHS at 350x350 or 400 x400
Buy a metre, cut a hole in the bottom of the safe and weld a piece of plate on the bottom of the SHS then poke the top of the SHS through the floor of the safe and weld it up
It will only have a door in the top half or 2/3 but you'll be able to feed them in ok
Will look odd but hey, don't we all?
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