So I settled on a chimney base that I think will work for this oven. Measured the height, and then calculated the correct height for the oven arch (x=doorheight/.63), and built a form 2" inside a cantenary arch (the arch center is inside the 4" mud arch).
The form will be burnt out once the arch has dried sufficiently and the nails will be swept out. This stage took a lot of sitting and staring.
Here's a close-up of the aluminum channel that my "automatic" closing door will hang in. More on that later.
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