I have begun the process of converting a 30 year old double wall oven to a charcoal smoker. The upper oven will be the cooking chamber, the lower oven will be the charcoal burn box. I got the oven at my local Habitat for Humanity Re-Store, for about $40. They had a couple, this one was the right price and had a steel shell that looked like it could be made weather proof. I have gutted out the electrical components, remains of the rotisserie, and the self cleaning chambers.