oven
You could use an angle iron frame if you intend to hang heavy parts but be realistic, do you intend to load this oven by hand? My current oven is built out of .040 stainless steel and .050 aluminum sheet. I didn't weld anything, it's all drilled and riveted with high temp silicone in the seams.I used tempered glass in aluminum channel frame. the seals are high temp inflatable. Don't set your sights this high and the aluminum and steel combo made for some interesting expansion problems to overcome. If you use steel try to use steel for most everything this will eliminate alot of trouble for you. 18 gauge or 20 gauge should do ok.The steel will also help stabalize the temp.You probably could get away with a rope seal used for fireplaces it's not very expensive and is easy to get, try a hardware store. I prefer latches that will give way in a miss-hap. Or use spring loaded hinges to hold door closed it's cheap and easy.Elements are not expensive how big of an oven do you have in mind? You can add more later easily if you leave room for them.Don't forget high temp wire, a good relay and a low voltage controller with a thermocouple to activate relay.The better you insulate the smaller the elements and I didn't insulate the bottom.You should have min 2 inches but 4 inches is better on all sides maybe more on top if you have room.
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