I've seen plenty photo's of corrugated steel panels used in teardrop construction.
Most of the corrugated stuff is seen on rat rod style campers. However it is still steel.
I realize you plan to use flat panels. From a material stand point steel has been used.

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Home built tears have been around for ages. I would bet every kind of material you could think of has been used a few times or more over the years. Using what's readily available to you is a good way to go in my book. I personally would talk to the material provider for some install tips/tricks. Tell him what you plan to do and see what they say about it.
Good luck with your build. Most of all have fun.
