Run the white uni 8/0 thread on down the shank to the hook point and trim away the excess.
Pull a plume of white marabou off the stem and catch it in on top of the shank for the tail.
Keep the tail short for competition rules, allowing for the fact that the marabou lengthens once it is wet: measure it against a gauge, then twist the fibers and pinch them away with your fingers rather than cutting them.
Wrap the thread back over the marabou butts along the body to keep it nice and even, then wind back to just past the hook point.
Strip some fibers off the end of the fluorescent chartreuse chenille to expose the core, catch the bare core in, and run the thread up to the eye of the hook.
Wind the chenille forward in very tight touching turns, wound in the opposite direction to the thread, stopping a short gap short of the eye. Secure it with a couple of tight turns, trim as close as you can with sharp scissors, then add a few more wraps to lock it down.
Strip more white marabou for the wing and wet the tip in water so the fibers stick together, then catch it in on top with tight thread turns.
Pinch the wing away to the same length as the tail, wetting the marabou again first so you can trim it nice and close to the thread.
Tidy up and build a neat white head, then finish with a double half hitch or a whip finish and trim off the thread.
Varnish the head generously on top, on the sides and underneath, dab off the excess with a finger, and run something through the hook eye to clear any varnish out of it.