I saw a small shipping container a while back and thought it would make a decent safe room bolted down in my garage with a door and some drywall around it to make less obvious but my wife said over her dead body lol!
Problems can arise using a container. Poured concrete is the way to go and if not then a custom steel room is a very nice alternative. The size is determined by you not a shipping container manufacturer. Tell your wife they make great storm shelters and door can be locked or unlocked from the inside.
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