Very simple: that was the easiest shape to weld up from the sheet stock I had from the drop bin at my supplier. The hood isn’t an issue because, as noted before, I don’t have one.
And here it is in situ:
Probably won’t have a chance to fire it up today. Maybe tomorrow.
I also welded up a dishing form. This is the end of a scuba tank cut off, inverted onto a ring cut from the same tank, and the whole thing welded on a piece of 3/8” plate.