Yes it is only a small one, I will go with 2 burners then. Save me some work if 2 will be plenty. I will have to look into making some refractory burners. I do have an old friend who is into blacksmithing who I am going to talk to. Could be fun trying to forge my own burner.
By refractory clay do you mean some kind of fire clay? To my knowledge that is the most refractory sort of clay, right?