Thank you for sharing. Regarding building with a shipping container. This video shows the way and the end results. He discusses the way to do it to avoid the issues you mentioned. In my region it would work well. In areas where sandy soil is more prominent maybe not so. It requires research though. This design was taken from researching bomb shelters.
https://www.youtube.com/watch?v=Z0oFJ2jbkDI source of video
https://faircompanies.com/videos/earth-cooled-shipping-container-underground-ca-home-for-30k/
Hope this helps those searching for a solution. Have talked to him via email as I work towards my structure. To date he has no complaints after many years now in his structure.