Hey! I feel the same way about clay. I want to keep experimenting. You could build any type of stove with clay but keep in mind that clay will suck up all of the heat. The absorbing of heat really slows down the effectiveness of the burn. I discovered this a couple years ago when I built my first rocket stoves (out of clay brick). Having a refractory core (I started using firebricks) helps. Many pizza ovens are built with the same materials. The other issue is cracking, especially outdoors, but there are ways to tackle the problem.