Why in the world would you go to the time and expense of building a home on someone else's property? All you are doing is benefiting them by adding value to their property. It's like building a house, giving it away, and then renting it from the person you gave it to.
I think you should buy a good safe(s) and then bolt it/them to those 4x8" floor joists.
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When in doubt ..... mumble!
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