I am just about finished on my oven curing oven. I started out with a proofing cabinet, about the size of a refrigerator, they are used by bakers. I got the cabinet from a local online auction for $20. I lined the cabinet with 2" rigid rock wool then faced that with aluminum sheet metal.

I have the PID controller from a smoker I built a few years back and only need to add the heating elements and it should be GTG for everything but artillery pieces as I have 40" of clearance.

I understand this is probably overkill but most of the stuff I had on hand.