
I had not seen the Indispensable Tool in the forum yet, but I'd read about using a large inflatable beach ball as an internal form. That didn't seem a good option with the teardrop shape. Neither did I want to fill the dome space with sand as Kiko Denzer did with his cobb ovens, so I took a piece of scrap Styrofoam and shaped it on the edges so it would act like a coarse plug for the open dome. Next I cut a plywood piece that would support the Styrofoam and simply used bricks to support the plywood from below. I then started placing plastic bags full of sand on top of the resulting platform. With the plastic bags pressed into the approximate inner dome roof line, I then covered the bags with damp builders sand. Once the sand had been smoothed and shaped, I started to cut, place, and number bricks for the next chain.
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