The beginning of my R2-BQ UDS project. Head is the bottom of a 22.5 OTS, and I removed the leg holders. The lid of that same grill had the flange cut off of it, and the flange was then welded to the top of the drum to create a docking collar for head. I used the bottom because I wanted R2 to have the right dome shaped head. I am leaving the One Touch mechanism in place to use as a exhaust dampener.