Only real difference from the original is a synth wing instead of calftail. Tied here as a flav; change to suit your needs.
hook - Dai Riki 320 #14
thread - MFC 8/0 olive
tail - grizzly dyed olive
rib - Krystal Flash pearl
abdomen - dubbing olive
thorax/pfd - 1mm foam olive
wing - Congo Hair charcoal grey
hackle - grizzly dyed olive (oversize by 1)
Part 1
mash barb, start thread; wrap to point above barb and make a small thread bump
even tips on some hackle fibers, measure (shank length); ti in/trim butts
move thread forward, take a hank of CH under the shank; pull up and post the wing
lay a strip (not quite gap width) of foam against the wing; tie in at base of post
pull the foam up on the far side; tie at base of post