The Gypsy Squirreltail Streamer (bucktail) is a fairly traditional fly, but one of the more effective ones I've found.
Hook: Mustad 79580 (4XL) size 2-8
Thread: Black monocord
Body: Royal red floss
Ribbing: Flat gold tensil (mylar)
Wing: Squirrel tail
Topping, peacock herl, 2 strands
Throat: ginger saddle hackle fibers
Tail: yellow saddle hackle fibers
If you've ever tied a streamer, there are no surprises here. Start with a solid and smooth foundation, tie in the tail, and set the floss before the foundation glue dries completely to promote body durability. Wrap the mylar tensil, tie in the throat, wing, and topping, being sure to get a proper balance. Finish with a wrap knot. Nothing special in regard to the bench.
Nor is there anything special in fishing it. In still water, keep the retrieve moving erratically, darts and drops, placing it off of strategic points like stumps and weed line breaks with a floating bug line. In moving water, play it to the current cross and down current, keeping a relatively low profile. Not a lot to say about the fly, except to mention the fun you'll have catching fish with it. This is one worth the time and effort on the bench.