Your bricky craftstmanship is pretty evident in your dome. Nice work.
But I do have a question for you... what did you use for a hearth?
In this pic, it looks like the oven is built on top of pavers laid on the soil. Did you lay down a waterproofing layer?
And did you use any insulation under the oven floor?

As David points out, moisture is a real problem for these ovens. If you don't keep them bone dry and insulated, they won't perform well.
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