I got an old imperial kamado last year for $10 and it had been converted to use a propane burner in the bottom. The shell was in great shape but the fire box and ring were shot. Used JB Weld for those pieces and sandblasted the metal and repainted. It now stays below 400F and works fine. If the price is right try JB Weld on the outside. Kamado King in NY had a bottom door as mine was rusty.