I've been using the Uniflame clone lid and parts for about a year now, and am having very good luck.
I really like the hinges.
I built my drum upside down and the lid sits right on top of the "bottom" rim. I didn't bend the edges but very little to match the drum rim. After a few smokes you get enough seasoning built up that it seals it pretty well.
It's all here in my blog.