dd, nice fly. This nymph style was published about ten years ago in a great nymph tying book by Jim Schollmeyer in 2001.
http://www.amazon.com/Nymph-Fly-Tying-T ... 1571882669 At least that's the first time I saw it, and I'm not sure if he cites someone else for the design or not. Such a cool technique because the pheasant plays the starring role as tail, back, wingcase and legs. I've tied this method of nymph for several species and it's a great pattern. The contrast between the back and belly seems to suggest a food item and matches some nymph naturals.
I can see it on an emerger style hook or scud hook where there is a clear top and bottom of the fly. I would be curious to see a soft-hackle pattern using this technique. maybe even something other than pheasant, like ostrich. It seems that the presumption for many softhackles is that the flies are tied "in the round" as I've heard it described. I see an argument being made for this nymph body tied with a softhackle collar.
w