So, this fall I did fish the N.H.S.B. Here are my conclusions.
The fly works as designed. The bare hook at the rear anchors it, and the radically tapered head pushes water. I did not need to place a hitch on it, although I have no doubt it would work with a hitch just fine. I did not catch anything on it, but that is my fault. I only used it a couple of times, once in a run that was most likely fishless, and the second time as a comeback fly for a fish that chased and boiled.
The action of the fly was solid, but after around an hour or so of being in the water, it had a tendency to sink into the surface film. All I had to do was squeeze out the water and it worked for a further half-hour or so before becoming waterlogged.
As graded by the harsh professor:
Definitely a fly for faster water. Works well in riffles. Works fine in glass water too, unless waterlogged.
And there we have it. From concept to vise to river.