http://www.geocities.com/birddogsix/  
Keith Lisle is a personal friend of mine and you'd be hard pressed to find a fairer guy to deal with.  If you are wanting a PA styled rifle or a custom knife, Keith's your man. 

http://www.iowatelecom.net/~toadhall/
This site belongs to Steve Bookout who is a Master Gunsmith and Blacksmith and also someone I call friend.  His site is chocked full of information on Southern Mt. rifles and tips and aids for building.  

 http://www.americanlongrifles.com/index.htm
This site is dedicated to promoting the American Longrifle.  The message board is visited by some of the best builders in the country and most are more than happy to help and answer questions the experienced or novice builder might have. 

http://www.americanhistoricservices.com/html/exhibits2.html
You will find more pictures of original longrifles and powder horns at this site than anywhere else on the web I'm aware of.  Take a look at the Gross rifle if you want to see a great example of an original upper E. TN rifle.

http://www.gillespierifles.com/
Dennis is the leading authority on the Gillespie Rifle. He is the most accurate supplier of parts and finished rifles. He is also the author of the book on Gillespie Rifles and Family.