Speaking as someone who is in the construction business, in the management/engineering sector...
I have never understood these folks designing long term buildings and structures using cargo shipping containers. The containers are constructed of the absolute lowest quality crap steel, and simply are not designed to last. If you scrape off the multiple layers of paint on any container more than a few months old, you'll often see a wall of rust. Usually they're only good for maybe a half dozen trips across the ocean before they're broken down for scrap.
-k