more info from 2011: http://www.archdaily.com/160892/the-pros-and-cons-of-cargo-c...
I do think they would run into trouble with the local building codes and inspectors.
"Shipping container architecture gets a lot of encouraging coverage in the design world as a trendy green alternative to traditional building materials, and seems like a smart choice for people looking for eco-consciousness. However, there are a lot of downsides to building with cargo containers. For instance, the coatings used to make the containers durable for ocean transport also happen to contain a number of harmful chemicals, such as chromate, phosphorous, and lead-based paints. Moreover, wood floors that line the majority of shipping container buildings are infused with hazardous chemical pesticides like arsenic and chromium to keep pests away."
YIKES!!
The container prep will be done offsite. This is a prefab project.
The biggest price will be land.
Interestingly: http://containerhouse.info/how-to-buy-container-home/