Mauser06,
I am like oldtraveler61 and agree with him totally. I also have all three sources and I look at it like this. Anyone trying to learn something new, needs to start out with an overview, then go to a more detailed version as he acquires knowledge and skills. Finally, once the basics are understood, one moves to the advanced class. These three oops allow one to go through this educational process at their own pace.i hope this makes sense. All of the three sources are excellent and have some points not covered in the other ones.
But, I and many other people can read about some task or technique and still have questions in their mind about the details of exactly how to accomplish it. The DVDs provide the visual explanation of what Peter talks about in the book and to me is real clarification of numerous processes that I scratched my head over before the DVDs came out. Be sure if you plan on buying the book, that it is the latest edition of Mr. Alexander. Building muzzloaders is something that I never stop learning about whether it be new techniques or ideas others have developed into something no one has thought of previously.
Mauser06, you say you are wanting to build a Lehigh school rifle. Mr. Alexander's book and DVDs are the only source available that addresses this school at all. I also want to build one of these rifles and have been studying everything I could find on the subject. They have numerous little subtle differences and Peter seems to address many of these. I have the DVDs but have not completely finished watching them. My plan, is to do a "follow along" build with the DVDs and a blank one day. I think that would be a neat way to learn more about building from start to finish. I have been to several classes and the biggest problem is we have never finished a gun in any of them so you never truely learn to do a complete build. Just my experience and hope it helps.
elkhorne