What an awesome idea and great story. I would love to be able to do something like this.

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This seems like something that I have to do. To many tornadoes happening and I have no basement. I do have a garage that I could this in. I actually think that every new home built should have a Tornado Shelter.
Our house is way too small. I have had to come up with different ways to "hide" things around it. One of the ways is to use trunks! I have an antique trunk that is out coffee table and it is full of food storage and stuff. I also have wicker trunks that are stuffed full. Trunk at the end of the bed that is stuffed. Just trying to come up with ways to put more things in this house is a full-time job. Our shed is full. The closets are full. Under the beds. LOL I have rubber made totes that I just throw fabric over to hide them as our night stands. When you have a small house - you have to come up with ways to store items that does not have them out in the open. So I hide it all in plain sight.
The Prepper's Pocket Guide: 101 Easy Things You Can Do to Ready Your Home for a Disaster