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You could actually use 3 or 4 kingsford briquets in there to heat a shack that size. Looks great.
I'd be very interested to find out the weight on that bad boy. It looks great, and full of great ideas. Please keep us posted.
Beeler: I would just like to say that you are a real Craftsman. I am impressed with your attention to details and skill with which you put things together. Great build! Thanks for sharing with us