Start black 140-denier thread at the rear of the shank only; there is no need to cover the whole shank yet.
Take about twice as much Natural deer hair as you think you need for the tail, stacked or not, and tie it in at the bend at least a body length long. Put a medium-tension wrap on first so it does not flare, then cord the thread with a clockwise spin and take a tight wrap forward to lock it. Trim the butts to clear room for spinning.
Comb the underfur out of a medium clump of Spun deer hair. With the thread corded, lay the clump across the shank at about 30 degrees where the thread hangs, take two loose wraps, then use the third and fourth wraps to spin it around the shank.
Pull any hair that has swung down into the hook gap back up with a bodkin, zigzag one wrap up through the clump, and move the thread a couple of wraps in front of it.
Pack the clump back hard with a hair packer, advance the thread and repeat with three more clumps, packing each one. Stop while there is still room ahead for the wings and hackle.
Whip finish the 140-denier thread and cut it off so it cannot be nicked while trimming.
Trim the body, bulk with a razor blade and then sculpt with scissors, thicker at the front and tapering back toward the tail.
Restart with 70-denier thread in front of the body. Tie in a Grizzly dry-fly hackle with barbs about one and a half hook gaps long right up against the front of the body, bind the stem forward a few wraps and snip it.
Tie in two wide Grizzly hen tips one at a time as spent wings, sitting in the plane of the hook and out at 90 degrees from the body. Leave the stems long so you can hold each feather by the stem while placing it, then trim the stems once both are set.
Wrap the hackle three or four turns behind the wings and one turn in front, using that front turn to push the wings back into position. Capture the stem with two wraps and trim.
Whip finish behind the eye and trim the hackle flat on the underside so the fly sits low and the spent wings show; the top is optional. Snip any stray fibers at the eye and apply head cement.