To be fair, pretty sure Popperfly asked for the recipe, not a wild guess...

A closer examination of the profile shots on Leland's site make me think that the abdomen of this fly is woven like a Bitch Creek Stonefly, although what material is used, I'm not quite sure. Underbody could be Krystal Chenille and the overbody could be a a dubbing brush of something like Arizona Synthetic Peacock, but do not know for sure. Tail, and legs are goose biots, wingcase is turkey, and thorax is Ice Dubbing as Normand stated, but this is an interesting enough pattern that I hope some can chime in with the real recipe.