Found this EHC variant on a Russian site.
hook - Dai Riki 075 #10
thread/rib - UTC 140 tan
back/head - 2mm foam tan
body - Zelon dubbing hydropsyche
throat/wing - deer hair
Part 1
mash barb/start thread; wrap to bend, leave tag end long
taper a strip of foam; tie in at bend
dub thread/dub body
pull foam forward; tie down
rib body/back; tie off/trim