That is def a work of art. But, just a thought…..in order to avoid starting out with a tremendous billet of alum, wouldn’t it be posible to machine the parts separately out of smaller blocks, and then weld them all up and fully cnc machine it? They would look like it was one single machined piece.
Like the flange, runners, lower plenum in 11 pieces (2 flanges, 8 runner tubes, plenum). Top plate is separate as it is.
I’m betting that is 4 blocks of billet that are machined and screwed together.
Top, bottom of plenum, and two runner sections.
