Approximate reverse engineer of recipe:
Rear Part:
Rib: tag of tying thread that was left long. I Europe they often use very fine threads that are nevertheless quite strong.
Tail: Ostrich herl. Leave tags at collar area
Abdomen: Chickabou tied in by tip and wound like herl, then wrapped with rib.
Collar: a few turns of the ostrich herl tags
Front Part:
Attachment loop: mono secured on top, threaded through Rear part, play adjusted, then bound down on top up to thorax and back a bit so it doesn't pull out.
Attachment cover/gills: Chickabou
Wingcase: Game bird of some sort, probably pheasant, though could use turkey. He uses a lot of whatever it is.
Thorax/Legs: Looks like a blend of Squirrel and Rabbit in dubbing loop, dubbed and trimmed accordingly.
Front collar: Ostrich herl wrapped around thread for reinforcement then wrapped to head.
Substitute at will anywhere in the recipe.