I have bought a cast iron grill or furnace and saw the top part had a nice shape for a possible firepot. The bodywork under the pan and grill is entirely hollow and looks like a pot. The hollow bodywork could help construct a tuyere inside. For airflow I have created a separate system that outputs an adjustable airflow through a 3.5 inch tube.
I'm wondering how feasible this is in terms of efficiency, as I am worried this will be as effective as a brake drum forge, which I don't find a good choice. The top bowl and grill can also be removed separately. Would it be possible to construct an efficient firepot with this or is it just not the right design or shape? If it's not the right choice, would that mean this is completely unusable as blacksmithing implement?