I don't have photos right now, but can get some today or tomorrow. (It's currently wrapped in a tarp, sitting in my driveway, awaiting its reconstruction.)
The two burners are from Marc Ward. I called him to describe the kiln and my plan, and asked if I could just add another burner to the one I already have, to save money. He agreed, so I sent mine to him and he's setting up the new system for me, including a Baso valve and possibly a pilot. They are B-2 burners, BTUs here: http://www.wardburne...uriburners.html
I was planning to coat the kiln with ITC 100, but Marc Ward advised me not to, as he used to sell it, and reports potters called him to tell him it had ruined their kiln. I've used it on two prior projects with no such results, but I only fired each of those kilns a handful of times. I was planning to use EPK/Alumina Hydrate as my coating, but could be swayed otherwise.
I could possibly be convinced to go downdraft, but no way in the world can you convince me updraft. That's what I have right now, and that's why I bought this new kiln.
The shelves are, I think, mullite. I realize those, too, aren't supposed to hold up to soda, but I intend to use them at least at first. Coated, of course. Everything in the kiln will be coated.
My idea is to build a bag wall 9" (or another number recommended here or figured out from those books!) from the short side, with both burners coming into this firebox. I'd like to line this firebox completely with cut pieces of those mullite shelves (which are now 13" x 26"). I'm hoping they will hold each other up if I put them in there just so; or possibly put castable in the corners to wedge them into place.
In the stacking space I thought I could build up the bottom with a few layers of soft brick, harvested from my current electric kiln conversion, which has 2.5"-thick walls. Then, on top of these, to protect them, a layer of cut up shelves/castable.
My confusion with the chimney is that all my research has been done online - and this research keeps repeating "use x, y, and z formulas to figure out chimney diameter and height. Unless you're using Venturi burners." But then I can never find info on that caveat. I did find, somewhere, that the chimney might only need to be as high as the top of the kiln - which leaves me in a conundrum about how to get the fumes out of the kiln shed (which has to have walls [with big windows] to keep out snow, as I'm in Canuckistan).
I have a very, very small budget for this project, but (assuming I can make the shed out of found materials) I do have room for the hard bricks necessary for the chimney and bag wall (if I'm told I can't use salvaged soft bricks for the bag wall). Although I do wonder, if the chimney ends up being high, at what point I could switch to metal or house brick.