Do you plan on sealing up the open (old exh) ports on the sides? This would streamline flow.
Looks nice, good job! Tom
Very nice work. Looks like it belongs there. Not a clunky mod. I don't know if it would be a good idea to fill what's left of the old 'stove' - though it would concentrate the heat on the floor where pooling can occur. That said, leaving it as-is maximizes the hot surface area . . .