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You mentioned a temp of around 450 degrees. I would like to make a mini Pizza oven that reaches 500 or perhaps even as high as 550 degrees. I would also add an alarm as well as a thermal cutoff as a safety measure. Am I pushing one of these ovens beyond it's temp limit. It should cook a pizza fast enough where you would not want to leave it untended. I would also consider mounting the PID controller externally.