Well I couldn’t handle Fusion coming up short.
I recreated this Firepit to be a 16" cube (15.5)
It is 3 pcs (down from 12 pcs ) the can to easily folded before welding.
16 inch circut board firepit cube stand.dxf (11.0 KB)
16 inch circut board firepit cube.dxf (697.6 KB)
Click this Link for a Viewable 3d model 
Made for 1/8" materials.
The cube fits on 1 32x48 sheet
The stand fit on part of 32x48 sheet
Warning I have not cut one out yet so there maybe errors.
I could do a larger size closer to the original the would be 4 pcs and still cutable on the cross fire pro if anyone is interested.
This has never been cut or tested for real so downloader beware.