These are really nice boxes.
I would like to look at the attachments that you are using. do you have pictures? are they slung or bolted on or both?
I would like to get something like this made in a developing country, rather than dragging them along with me on the plane. In the absence of 2.1mm ali and facilities to weld it, what thickness of steel would give the same strength? I guess at least 1-1.5mm. I would reduce the depth to keep the weight down, of course, they would need to be painted inside and out too if using steel. Another option would be to use thinner gauge ali and rivets and possibly ribs for strength.
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