Have you considered building a home from used shipping containers? If you like modern architecture and are looking for sustainable materials, take a look at what’s being done with shipping containers. From beach cabins to massive homes and even office buildings, they are an exciting way to reduce, reuse, and recycle.
Sorry Tom, I have never gotten that far in the research. If I ever had a buyer who wanted one I guess I would start with google, then go to the city building dept and see if they could tell me about permits and any existing container homes in the area. You could also ask on the alt housing forum on craigslist.