I've decided to start on one and begin my quest for a food grade drum locally today. Disposal of these is tough and since I don't live in too populated of an area I'm hopeful this won't be tough. My question as I begin to lay out my plans is this: Has anyone experimented with two cooking grates on their UDS? All the pics I see have one top grate and I thought about doing a lower grate also. When hanging stuff from the top I could remove the top grate and still use the bottom one, or run two grates w/some fish on the bottom grate, around the periphery perhaps. Do you think there would be too much heat variance between the two grates?