I can’t say I’ve ever seen anyone trim out their chenille, but I like the idea. This is a pretty simple pattern for a large Hex nymph. Nicely tied up by Todd Nutt of MaineFlyFish.com

Hook: Daiichi 1760 #4
Thread: 8/0 yellow
Eye: Beadchain eye
Tail: Ringneck pheasant tail
Body: Tan chenille
Thorax: Yellow rabbit dubbing
Whingcase: Ringneck pheasant tail
Legs: Brown hen hackle