It's not the same instrument, so maybe the one he had at WVA 2005 is a "refinement." For that one he used a bass drum for the "tub" and a banjoish rig. He should'a got something better than his wheelchair for the street stomps though. He was having a lot of trouble with the gravel on the roads.
Thanks for the link. I'll have to check out his I.D. next Sept at WVA 2006. His original, at your link, appears to have come from about the same time when my "more-guts-double-gutbucket-double-bass" design got built.