Colby, just make sure to take your 22" lid with ya.... that way you can have a top grate like on a OTG/OTS, if you just use the drum's lid you'd have to have your top grate a few inches below the top of the barrel. Not a problem, really, but it's one of my considerations. I haven't built my UDSs yet.
And yeah Earl, that thing is sick! (very nice)