Ok i'm doing my UDS build now and i'm most definitely using my flat barrel lid because it fits and seals so well (kind of like it was made for it) lol.... Anyways i also want to have the capacity for 2 racks. Most times i'll just be using the flat lid but i'm picking up a second barrel lid for this test and if it works i'll have 2 lids. I know alot of you welded a ring on the inside of the barrel so the kettle lid fits better BUT here's what i propose, you just tell me if it will weld ok. If this works i'll be able to use a flat lid or the kettle lid depending on what i'm cooking. Step 1) Cut out the center of this lid leaving just the outer ring Step 2) Set the kettle lid on the barrel lid ring and weld them together. I'm not a welder so i'll have someone else do it but this will give you the perfect tight sealed fit if you want to use the kettle lid...Will it weld ok?