I would suggest getting a cabinet maker to put one together for you.
I am buildin..... (well I haven't gotten started yet) one that takes up the full floor, has a hidden area that is also protected but accessible and is all locked by remote dead bolts. I already have the drawer slides that will handle 500lbs and will slide out to 40". I have my plans drawn up and a few pieces cut but as with all of my other H2 projects, it's on temporary hold.
But this is the best option to get exactly what you want and I am spending maybe $400
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