Start the thread mid-shank. Build the extended body off the back: bind a thin olive foam strip (with 2-3 microfibett tails trapped inside its tip) at the 60% mark and segment it rearward with 3-4 open thread bands, leaving the body extending about one shank past the bend; whip the tip and return the thread to the 60% mark.
Post a hi-vis para-post wing upright at the 60% mark, anchoring its base with a few horizontal wraps so it stands tall (it lets you track the fly at dusk).
Dub a robust olive thorax fore and aft of the post.
Tie in the grizzly/olive rooster hackle at the base of the post; wind 5-6 parachute turns down the post and secure it under the wing.
Sweep stray fibers clear, whip finish behind the eye, trim the post to about one shank, cement the wraps.