If it's good enough to make pottery, with all the complicated glazes (thats COMPLICATED), simple bottom - top heat calculations at a relatively low temp should be easy. I like the crossdraft, U-shape supply with adjustable vent. It's close in concept to the LBE. Can you take some pictures of the other potter's ovens? Are they much different?
I'm really looking forward to seeing how it turns out, with you and Meesh collaborating. I live in an area with lots of good clay, plentiful firewood, and my wife used to make pottery in a little kiln - I'm thinking of giving this a try too.