Summary and area for improvements:
Material used
3-4 bags of fire clay @$7/bag
2 bags perlite @$14/bag
3 bags Portland cement @$3/bag though I can't remember exactly
3 bags sand @$5 per bag approx
1 4X8 3/4" solid core plywood @$40
8 2X4 studs @$2 each
box of 3" drywall screws
24 fire bricks (Rutland 9 X 4-1/2 X 1-1/4), i.e. 6 boxes @$25 per box
12 pavers (12 X 12 X 3) @ $3each
Total $326
Performance of the oven has been great. It takes about an hour and fifteen minutes to get the dome and the deck properly up to 950 and 750 though I like to go longer because as soon as the fire is shoved to the side to begin cooking, the deck starts to cool. That said after 2 hours with the coals to the side the deck is still about 425 or so. About perfect for bread.
Pizzas take about 90 seconds and it is critical to have a pizza turning peel and a large brush to sweep the coals to the side and clear off the ash.
The small round peel allows you to spin the pizza as it cooks as the coals are on one side of the pizza.
Reliability:
As expected due to the high heat the dome has developed hairline cracks on the outside due to the expansion and contraction. So far I don't see this as a problem.
Areas for improvement:
I wish this was better insulated and had the ability to hold the heat for days. If I was to make again I might consider putting a ceramic blanket on top of the pavers/under the fire bricks and put one over the dome and mud it in place. The reason I didn't was due to the cost. That would add about $160 and I considered this project an experiment.
Weatherproofing - I use the redneck method
I keep a tarp over this when it rains as I don't want it getting wet. I may seal the concrete but haven't looked into how well the sealer works with heat.