In the desire to increase my swing speed I have been following this post and really believe in the premise. I have been trying another method that I hope doesn't come across as too simplistic.
Iron heads are always heavier than a driver head so I took an old Taylor made 4 iron head and put it on a 45" driver shaft. It gets me right to that 15% heavier weight that the program calls for, plus I'm looking at and swinging a real looking club. To get the feeling of a lighter setup, I just choke down on the grip thereby reducing the overall weight feeling. Seems to make sense and works for me.