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Update on the firebox - you don't fold it into 1/3's actually, but 6 inches in from the ends so you end up with a 12 x 12 x 6 high box.

I found mine at Lowes in the area that was mentioned, it comes prepackaged in cardboard. 12 inches x 24 inches - 18 ga.  I got two so that way the bottom will be doubled when folded into 1/3's and set one inside the other with the sides opposite to  give you all 4 sides that way.

 I see that many are doing the extended chimney/duct pipe mod, so what if you did that but instead of going done on the same side of the chimney, run the duct along the back and come down on the other side (firebox side) ?? If you have tuning plates w/firebox baffle wouldn't you have reverse...