Re: lets talk about shipping or sea containers
My old boss used to put window units and whirly birds on them. He even made a side door for it. He was trying to sell them as hunting camps. If I was going to try to insulate it, I think I would weld some kind of brackets on the wall so that I could spray foam the walls and cieling and then use those brackets to mount plywood.
Gainfully employed= shooting somebody elses bullets and getting paid for it