A little different shellback, to improve durability; wrapping it with the rib would work, too.
hook - Dai Riki 320 #14
thread - Danville 6/0 black
tail/shellback - mallard flank dyed woodduck
rib - small wire copper
body - peacock herl
hackle - grizzly dyed hot orange (undersize by 2)
mash barb, start thread; tie in rib, wrap to bend
measure (shank length) some mallard flank; tie in/trim
instead of using the butts from the tail (as on the original), prep the tip of a flank feather; tie in back over the tail
tie in some peacock herl; wrap forward, tie off/trim
tie in hackle; wrap to bend
capture hackle tip with wire; rib body, helicopter end, cover with thread, trim hackle tip
pull mallard forward; tie off
trim, whip finish, SHHAN
Regards,
Scott