Hi,
Interesting
concept.
The corrugated steel re minds me of one I saw on a TV program about a retired couple in a Toyota flat tray researching birds in the Lake Eyre basin. They had a steel water tank lying on the tray, it had a door cut into the back, (end of the tank) and some sheeting inside to form a floor.
It was rough, but suited their needs of cheap, practical and light weight. With a bit of preparation, they could roll it off and leave it as a base camp. Very appropriately I thought, they called it their Hollow Log.
cheers