[patcheudor]

This! I've looked seriously into making a large shipping crate home by slowly accumulating them for storage and whatnot at my farm. Ultimately, after learning about the hazardous materials used in many, I gave up. Besides the points mentioned by abakker, one of the things that really got to me was the 'mystery box' aspect. Simply put, you don't know what they carried or what got spilled inside. Was it carrying pesticides? Did a bunch of compact florescence break inside in a storm releasing mercury into the container? There have even been reports of shipping containers which are radioactive above background levels, presumably from spilled nuclear medical waste or shipping something like Uranium ore. Before you call me nuts:

"About 20 million consignments of all sizes containing radioactive materials are routinely transported worldwide annually on public roads, railways and ships."

http://www.world-nuclear.org/information-library/nuclear-fue...

Note that sprayed on closed cell insulation does little to nothing to mitigate many of the toxins which can be found in shipping containers including mercury - it just makes it poisonous for longer. To use them for a dwelling all wood needs to be removed and they need to be sand or water blasted down to bare metal.