Well, getting tab for it would be complicated and useless as far as I can figure--there are lots of tunings you can play that particular application of the chord scale in. (G-Am-Bm-C-G-Ddeedle-G)The Nic Trick is to snap the strings just right in that wonderful slightly off-kilter way he has, it's what makes his accompaniments so distinctive but not distracting except to fanatics like us, (they're not really all that complicated although I wouldn't care to try duplicating them...that's what makes em great).
This just plain can't be learned off paper. Only by listening and trying.
I've tried it in DADGAD, but prefer Semi-Standard Dropped G-C (CGDGBE) which provides a I, V and IV open bass but you don't have to relearn all the treble string positioning--try it its fun!
Willie-O