Hey Phubar,
Here are the three lids I have.
The first one has a rod welded around the edge and a flat bar welded to the rod as a lip. It was only spot welded so I used high temp sealant to stop it from leaking. It turned out a bit heavy with the rod and the flat bar being added, but works fine and give me plenty of room on the top grate.
The second is a shorter one where I took a lid and cut the center out and welded it to a 6" bottom of a donor drum.
The third is just a lid. I use it only when cooking on the lower grate.
The fourth pic is a buddies drum where he cut the lip off to be able to use a weber lid. And you can see where the stuff runs. I am to anal to deal with that way of doing things, lol. I would be rubbing up against it and getting pissed.