Another update. I finished up the oven in about 3 days, approximately 16 hours. Here's a pic. On to the chimney, exterior, & insulation.
My final dimensions ended up at 31" x 31" interior, with an 18" dome and an11.5"h x 18"w entry way. That's the biggest cooking surface I could get with what I was working with. I also did a test burn in the fireplace below, and it drew very nicely. I'm going to mimick the fireplace arch, as best I can for the entryway to the oven. For the exterior, I think I'm going to carry the brick to the same height as the oven sidewalls, fill whatever gap is left after the blanket with vermicrete and then stucco the top following the contour of the barrel roll. (At least thats the plan right now)
