Hook: Alec Jackson Spey (Daiichi 2051 or 2050) Size #3 through #1.5
Tip/Tag: Fine Silver Oval Tinsel and 'laquered' Hot Pink (#2) Glo-Brite Floss
Tail: Sparse Hot Orange Bucktail and 3-4 strands of Black Krystal Flash
Body: Hot Orange Angora Goat Dubbing
Eyes: Umpqua Mono Nymph Eyes (Large)
Body Hackle: Light Flame Saddle Hackle
Carapace/Back: HareLine Shrimp Pink Flat Diamond Braid
Head: Danville un-waxed 6/0 Fl/Fire Orange Flymaster thread
There are many Orange or Hot-Orange Prawn/Shrimp patterns that were developed primarily for late winter steelheading. Alec Jackson's Sauk River Shrimp, comes to mind. This prawn pattern is closer to Joe Kambeitz'z Squamish Poacher, using different materials, but with the unique Scott Howell style.
You can read about Scotty and see many more of his flies on his page on this site, Scotty Howell Flies.