ovens
I use a home built oven every day and this is my third oven so far, they seem to be growing. Yes an easy way to build is sheet metal box insulated and put inside another box. That may be over simplified but an oven is not complex. Place a low speed fan outside the inner box with the shaft protruding inside with a metal fan blade for circulation. Elements and controls are your preference, many different types will work. Keep one tip in mind when building an oven, design the oven so that it will accept hanging parts or racks. I have seen a couple of ovens that would not support even 20 pounds. Insulation is your choice, I use home insulation, fiberglass type with paper backer removed. Remember to not try to build an air tight oven it will need to expand and contract. If you use sheet metal (steel) then you will have to preheat the oven and allow the oven material to heat soak before it will stabilize the temp.
jdrax -- you can add more elements easily but sounds like you may need wiring help if you have to ask. Most home ovens are 220V but they only apply 110V to each element and they usually only run one at a time unless set at preheat. I used the preheat setting all the time when I used a home oven. Check your elements they may be labeled 110 and 220, meaning they can handle both, if you move them to a bigger oven you may need to rewire them for the higher voltage to get the warm up time down to an acceptable level. Be careful and don't hesitiate to call a heating element manufacturer and pick their brains. Good Luck its not hard if you use common sense and also side with safety over economy.
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