Buy the time you're through reinforcing a container and the logistics of placement,there not cost effective from what I've read.
Awhile back someone posted about inflatable cement impregnated material structures that only needed to be set on a level cleared area, inflated, wet down with a hose, let-um dry a couple days, and bingo instant structure. There available in several sizes and types , some, pretty damn big too!!!
I was thinking one of those might just be the cats ass for a camp on a piece of land I was considering in NY, but I couldn't get a line on any in this country at that time. What a nice maintenance free ,secure camp, done quickly and with minimal impact. Very cool!!! They showed them used both as bunkers in the heavier thickness ones you could bury and other models being used as hospitals/emergency facility's and housing in 3rd world countries above ground. The video I saw of them said in arid areas they could be in use in as little as 24 hours and set up by a half dozen guys in like an hour or something like that then just inflate them,,wet them down,let-um dry and done,,amassing,, how sweat is that???? Oh you can get just about any window door combo you can think of too, pre-made openings where you want them then just cut the inner bladder out and hang standard doors or windows.
Shipping containers would be good for folks in tornado areas to have though. A small container backed into a trench in a bank, back fill lightly and you've got a dandy storm cellar that could hold quite a few folks if need be. You can cover a container without reinforcing from what I've read, but just 3-4 "max and sides and top will need some cross pieces, weight is only carried in the corners on containers nowhere else on the sides or top. But those reinforcements are way less to do than a bunker set up. Ran into plans for those while researching those cement buildings. Be a great place to keep all you're survival/storm supplies in also, that would protect them more from storms in tornado prone areas, and free up space in you're house for living. Plus you preps are protected from storms when you're away and you're house gets blown away. At least you have something left and a place to live for a bit.
Those small ones are only 1800 delivered around here, that and a bud with a dozier or a backhoe that owes ya a favor and you're in business. Hell you could have one hell of a storm shelter for 3k or less, depending what you already got on hand and how many buds owe you a favor. To me if I was in a area where storms like tornado's were common,,,that's a damn cheap insurance policy on you're family's lives if you ask me. I lost one of my sons many years ago to a tornado in Mo. and many years after my first X and I had split up, where they were, something like that would have saved him.
Before I go looking all over hell again to find them, does anyone have a link on those cement structures handy or seen them before?? I'm wondering if there more available in this country by now???
Those are a great idea IMO!!!