The kiln at cone 10 in the first chamber, and cone 6 in the second chamber.
Greta and Michael get put to work laying the insulating brick for the first layer of the floor. Below that are foil to stop moisture and air penetration, and concrete block to further shield the barn floor from the heat of the kiln.
The floor of the first chamber and the lower walls of the firebox are complete. The floor for the second chamber will be laid later so we aren't walking all over it while we build the first chamber.
Confirming the center of the chimney will go through the roof at the correct spot.
Catenary arch forms are determined by a hanging chain.
Spray paint traces the paper forms onto plywood to create arch ribs. If you make the ribs in halves, you can get a bunch on a sheet of plywood.
The ribs are in place, level, and straight. 
Lath covers the ribs to create the arch form for the first chamber. Only the back half is done here. 
Chris tosses Liston a brick as the walls start going up.
The first day of brick laying got us this high on both sides. This is the back end of the first chamber.
The second day of brick-laying brought the walls 2/3 of the way up. As we get into the curve of the top, things go a lot slower.
We are starting to cut brick wedges to help the bricks match the curve of the arch.
We cut these 9x6x3-inch bricks to make the key for the door of the first chamber. This was a happy moment!
Lots of little wedges go into helping turn the compound curve at the top of the arch.
This is about as far as we can go without multiple cuts of each brick to get a custom fit.
Steve and Dan work Mizzou castable into the remainder of the arch. This is a very strong way to complete the form.
The wedges supporting the wooden form have been removed, so the arch is now free-standing. Erick starts the job of dismantling the form.
Looking down the completed first chamber from the second chamber end.
The crown of the first chamber, showing the castable (dark colored) and some excess mortar that will be scraped off.
Pat working the water-cooled brick saw. You almost cant build a kiln like this without one!
The second chamber overlaps the first by 13.5 inches. It's a puzzle to get square bricks to match a curved arch.
Yoshi placing the 18x4.5x3" lintel bricks over the stoke hole of the second chamber. These bricks were from then-on known as Yoshi Bricks.
Firebox walls on the second chamber are complete. The second iteration of this kiln, at Juniata College in PA, has straight corners instead of this stepped pattern. Much better.
Dan figuring out the exit flues and the chimney base. The back wall of the first chamber is a rough draft and was built without those big burner blocks.
Now we understand the exit flues and chimney base. Very few of the bricks in this kiln are standard sizes or shapes, so there was a lot of head-scratching to make them fit a kiln designed around a 9" straight.
The chimney and back wall is starting to rise now.
The chimney flue is divided by a wall to support two dampers.
The back of the kiln showing clean-outs at the base of the chimney. 
Trying to figure out the arch with non-standard arch bricks. We eventually found a pattern that made the perfect barrel arch for the chamber.
Transferring the arch pattern onto plywood to make ribs.
The ribs are connected and ready to go on the kiln. After it's up there, we'll add lath and masonite to support the bricks.
The arch form is supported by concrete blocks inside the second chamber. It is square, straight, and level.
This arch went on in about an hour! The key is cast with Mizzou castable.
The arch is supported with buttresses and the form removed. Pat and Dan are pleased.
The steel frame is bolted up, and Dan is doing who-knows-what with that saw.
Dan figuring out the corbel of the chimney taper.
Cutting through the roof so the chimney can pass through.
Looking down the completed chimney. The bricks sticking in are 'ticklers' that promote turbulence in the exhaust gasses for more complete combustion.
The complete kiln, waiting for the castable coat on the first chamber.
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