I'm using brick that are three inches thick. Plans for this kiln use 2 1/2-inch-thick brick, so I have to make adjustments. The holes in the front will draw air into the fire box. The wood will be above the air intakes. The ware bed (where the pots will be located) will be on top of the concrete box, as well as the chimney.
Even though it was a dry run, it felt good to be stacking some brick. Having never built a kiln, I have a lot to learn, and I learned a lot by just stacking these brick.