Interesting Video
YouTube "7 reasons why container homes are a SCAM"
BTW I did a BS estimate of building a 8 X 40 foot box, basically a long garden shed and it was $4K to $5K naked and a lot easier to window and door than a metal box. I wonder if @jc100 has the costs on his shed.
it would need siding and interior fix ups but with a lot less special work compared to a metal box.
Including purchase of the resin shed and all the material to build the base I’m at about $3.2k. That has gotten me a concrete mixer and a cordless circular saw too though.