Here is the fly pattern sheet for Randall Kaufmann’s Simulator Peacock nymph.
Materials
Hook:
Daiichi 1720 or TMC 200 or 5263, #6-12
Bead:
Optional
Weight:
Optional
Thread:
Danville 6/0, color to match
Tail:
Turkey biot or olive marabou, tied full and short
Rib:
Copper wire
Body:
Peacock herl
Hackle:
Furnace hackle, palmered
Fly pattern: Tying Nymphs (1994) by Randall Kaufmann.