I'm backing down a bit for the containers as housing at least for now because there is such a greater demand for housing that can be done with less than a day's work and I think the availability of containers would be limited.
Containers for now should be used for field offices and on site storage since they can be secured more readily. Too hot? Just bury half of it with the north side exposed. Line it up east to west. You'll have about two months around June when the sun is to the north but it won't be horrendous. You could also face it to east so it gets sun in the morning all year, but after noon it would be sheltered by earth.
The parameters I'm trying to work with are under $500 for 16 sq meters minimum with the covering and some finish work to be provided by the occupants. They should also be able to be built with minimum skills and tools. I'm trying to keep the parts list to less than 10 different items. The latest idea uses 4" PVC posts filled with concrete set 1 ft into the ground and a 3/4" PVC pipe woven to make a support for the covering. All pipes are tied where they cross and the ends are connected with 1/2" rebar:
For now the shelters simply need to be built to greenhouse specs with an opaque covering and able to withstand high winds. If possible, I'd be using Tyvek for the covering since it reflects light, is UV resistant and is moderately priced. Something like this could be covered with steel mesh(tied to the PVC piping) with a skim coat of stucco.