Recently finished a 2 oven vertically stacked smoker project i have been working on. I have a Char Griller Kamado style cooker but it has a limited space and since i have a big family and like to feed everyone i needed more cooking capacity. I decided to build a smoker that was going to be just 1 oven and was having problems with the firebox so i just decided to use another oven as the firebox. My main goal was to be as economical as possible since i could just spend a couple hundred bucks and get a bigger smoker. I got the 2 ovens for free and used parts and metal i had lying around or pieces i stripped off the ovens. In the end it cost me about $20 to make the smoker. With the 4 cooking grates it has over 1500 square inches of cooking space.