Chris Williams' semi-Hacklestacker with a PFD. Tied here as in generic shades of grey; change color/size to suit your needs.
hook - Dai Riki 320 #14
thread - Danville 6/0 grey
tail - hackle fibers grizzly
abdomen - goose quill natural
shellback - 1mm foam grey
indicator - Mcflyfoam hot orange
hackle - grizzly
thorax - dubbing grey
Part 1
mash barb, start thread; wrap to point above barb and create a thread bump
measure (shank length) some grizzly fibers; tie in, jam against the bump to set tail angle
tie in moistened biot, notch side down for ribbed effect; wrap biot to 2/3 mark; tie off/trim
tie in yarn
tie in foam strip (1/2 gap width)
tie in hackle