I did see that and gave it a lot of thought. In the end, I was just looking for an excuse to make something on the lathe (and mill). 😁
I am really trying to clean up the engine bay to remove, or make less obvious, all the hoses, wires, etc. running around. That's why I decided to mount mine under the intake. The filtered air hose will run to a port at the bottom of the MAF sensor boot from the air filter. The air valve body can rotate to any position to facilitate the routing of the hose to get it to follow the same route as the boot. Also, the hose, air valve body, and boot will all be black and less visible - especially against the blinding brilliance of the polished intake, head, timing cover......
Well, a fella can dream can't he?