I'm reasonably certain that I can go with a single burner and heat up both the dome as well as the deck to the right temps. What's your output at right now?
With a $50 bayou burner, my 1/2" baking steel gets up to 700F in 5 minutes. Way too hot for the deck for regular pizza, which I prefer at 500F or so, which is why I need two burners - one to control the deck temperature & one to control the air temp. I need the air inside to get up to a good 800F without affecting the deck temperature. With my 12" tailgating pizza oven, it has a single ring burner that heats up dual pizza stones with a ~250F temperature difference. So if the air is 800F, the base will be 550F, which works out pretty well; I've been using it once a week since I got it on Black Friday & it has been a gem. We now have family pizza night every week! :thumbsup:
However, because I want a bigger 16" pie (family-sized), I'll need a larger enclosed area. So step #2 is to buy some more bricks, extend the dry-stacked rectangle box out, and see if a second burner does the trick. If so, then I'll invest in a DIY baking steel that is large enough to accommodate a 16" circle...the steel will cover the first half of the deck, and the 10" burner will sit in the open space behind that (no deck on the second half, and the rear of the steel blocked off by an angle iron). Really really simple design. I cooked a steak in the square box (step #1, 150 bricks with a burner & steel deck) and it came out pretty good, now I just need enough volume to heat it up properly for the size pizza I want.
I'll probably finish it up over the holidays. I need to pick up a propane splitter, borrow a friend's burner, and get some more bricks. If everything works out, I'll finalize the plans & post back. I'm not sure if it will since I have never built an oven and very few people have done a dry-stacked brick gas oven. Alternatively, if that doesn't pan out, I may just built a big cob oven before the snow starts.