Re: wall thickness
i used 25ga 2x4 studs, with the wall thickness being the 4" dimension. the insulation i used was R15 fiberglass insulation from home depot, with the kraft backing removed. it does a good job. when the oven is up to temp for extended periods the walls get hot at the studs. if that's a problem for you, search the forums on here for how people have insulated the studs from the inner and outer walls.
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Len
Figure Engineering, LLC
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