Byron, I use just a little bit different method with about the same results and the feather across the back is then protected:

I will use pheasant-tail fibers as shown in the article, or Scud Back or Mylar as a wing case.

Here are a few pics of nymphs I tie this way:





I also tie several emerger patterns using CDC puffs in much the same way:



Check out this old Fly of The Week submission I did which shows a similar method of making nymph legs with hen feathers: http://www.flyanglersonline.com/fotw...tw20100208.php