I would not have any problem with it assuming they were properly laid out for good living arrangements. Those things will last a lifetime. Amazingly durable. I have a couple for storage and some shop equipment and just love them. I power wash them inside and out and then spray with a nice new paint job. Brilliant white inside and barn red outside. Get a thick layer of white elastomer type paint on the roof and they will be amazingly cool inside.
EDIT: They are made from Cor Ten steel. Here is a link about working with that type steel when welding, etc.