I've pondered and would like to get a 20' shipping container (the shorter of the two ) and set it right next to the back bedroom and put siding and a small roof so it looks like an addition matching and stuff. Make a smaller door withing the regular door that slides as opposed to swings and be able to get in it without going outside. Set it up like a mini house with bath and kitchen. May sound kinda extreme but Katrina showed me what can and has happened. For tornados too. I don't ever want to relive that but just incase.