Sheet metal bending

Well, It looks like I misinterpreted how the tubes were used. I'd assumed they would be ¾ cylinders (thus the machining suggestion) placed outside the walls and used to hold the corners together. My mistake.

Is this stove just for show-and-tell, or is it actually intended to hold a fire? If the former, you might be able to repurpose the frame tubes of some lawn furniture. What I've seen (and used on occasion) is about ¾" diameter and (based on your diagram) suitably thin wall. Hope this helps!
 
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