Hey Art,
I'm not so sure that gavanized sheet would be your best choice. If I remember correctly, when heated to high temps it emits some pretty harmful vapors. I might be wrong about that, maybe someone else can confirm or deny. If I'm correct, then not only would it be harmful to you but it would also add some unwanted chemicals into your curing process. My understanding of oven building is somewhat limited but I think aluminzed sheet is ok. I'm not really sure about the thickness, but have seen, where some have used 14ga sheet. As far as a fan goes you could probably use a fan from any standard kitchen convection oven. I would also make sure to use some sort of baffle to make sure that you don't blow the powder off your work.
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