Jerry:
If produced, I would definitely be in the market for one. I like the look of brown leather, although there are plenty of folk on here who also like black.
I do not own a nylon Nightstalker, though I had to tell myself no a couple of times due to budget and what not. If you are making/going to make them out of leather, I'll hold off and wait for that to happen before ordering. Leather just seems more appropriate to me.

That prototype looks great by the way!