Hey Jeff. I make syrup as well. My current setup is a concrete box that I burn wood in. It's very simple but uses a lot of wood. I'd like to redesign it into a rocket stove. It measures 2' wide 3' ling and 2' tall roughly. I know this is vague but could you give me some insight on how to redesign it? Currently the air comes in below the wood. You might be able to see it below the door. I'm about to figure it out, if my box is 36" deep how long should my fuel shelf be? Im sure I'll keep adding questions to this. Thanks, Kirk