Eric,
I love creativity. Your build to date shows that. I am sure that it will be great however you finish it. As for as flue liners go I think 8"X8" or at least 64 square inches cross section is what is recomended for a 42" oven. I think that 8" round would be less square inches cross section but, most believe that it is more efficient. That gets into Pie-R-Square ( way above my pay grade)



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