Found a series of 50 variations here. Pre-made dubbing brushes would speed up the process.
hook - Dai Riki 280 #10
underbody - non-tox .025
thread - Danville 6/0 brown
tail - partridge brown
abdomen - small wire gold/hare's ear dubbing brush
wing case - pheasant tail
thorax - same as abdomen (but a bit thicker)
Part 1
wrap front 1/3 of shank with non-tox; tie in thread, wrap to bend
measure (gap width) a clump of partridge fibers; tie in/trim
tie in wire loop; wax
insert dubbing in loop (keep it sparse so the wire shows thru), twist
wrap forward to 60% mark; tie off/trim
tie in a clump of pt
repeat dubbing loop sequence but with a bit more dubbing