Took an alum pizza pan with holes, added alum door screen. SS would be stronger but I couldn't find the right size/type of SS pan and SS screen was really expensive.
I took the flat pan, a big steel bowl and a rubber mallet to form the pan into a slight dome shape.
Ignore the galv fitting in there on the keg. That was just temporary to hold my sight gauge while I was working on it. It's been replaced.