Based on a pic from the Henry’s Fork Angler site. A few alterations in materials, a bit fuller-winged than that one and I’m not crazy about my choice in thread color (which switched during the tying process); notional sequence but with the materials at hand, it seemed logical.
hook - Dai Riki 300 #10
thread - Danville 6/0 tan/MFC 8/0 sand
rib - small wire copper
abdomen - dubbing yellowish tan (bleached Aussie possum)
thorax - Ice Dub Hare?s Ear Tan
shellback/tail - shmootz from pheasant rump (marabou-like)
wing - Congo Hair baitfish grey
hackle - partridge
Part 1
Mash barb/start thread; tie in rib and wrap to bend
Dub thread/dub abdomen to 2/3 mark
Dub thread/dub thorax to 3/4 mark
Measure (gap width past bend) pheasant shmootz; tie in/trim
Rib body; helicopter end/cover with thread