Coffey's Sparkle Minnow is a fly that I always have in my streamer box. It works. There is no need to substitute materials or change anything about it. I do like articulated flies and using the new Spawn Fly Fish bent shanks it makes it soooo easy. There are a few other tweaks added to the fly to help with profile, but the key is to build that taper as you progress through the body to the head of the fly.
Materials:
Thread: Semperfli waxed thread 6/0
Hook: Ahrex SA280 Minnow #4
Shank: Spawn Fly Fish 60 Degree 20 mm jig Shank
Bead: Firehole Outdoors 4.5mm Slotted Tungsten bead
Tail/Head: Natures Spirit Fish hunter marabou Brown Olive and White UV
Flash: Copper Krystal Flash
Body: Gold Ice dub and UV Pearl Ice Dub
Hackle: Whiting Farms Brahma Hen Saddle
Glue: Z-ment for body, Bone Dry UV for finishing the heads of each section.