 Re: flue, from back or front?
You can angle the flue liner back along the dome to the very top...most building codes won't allow sharper than 30 degree angle in flue but I think you could swing that without much trouble. You could even contstuct that lower angled portion using firebrick as opposed to terra cotta or steel. I would recommend widening the throat from 5 or 6 inches to 8 or 9 inches to lessen the amount of smoke that might sneak out of the outer doorway during firing. Do a search for "squirrel tail oven" and you might see some examples of how you would do it...the Amish used to do it that way.
Best
Dutch
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