I slept in one during gulf war one.....built a 2x4 wall and added a air conditioner and a door, bunks and a table w benches for my EOD team and our gear. Sand bagged that puppy up with an excavator and a dozer and slept nice and easy thru the scud sirens and the one or two that hit close by....
Love those sea containers and conex’s for improvised hooches .....
Sounds comfy and safe, considering your circumstances.