Gosh, you sure you got that right? I love these video's about construction of containers
Part 2
https://www.youtube.com/watch?v=ZFvXpLRw30A
Part 3
https://www.youtube.com/watch?v=meZ-rf_wHVE
shipping container vs firearms
https://www.youtube.com/watch?v=NP0_A65eJWg