As Mike Brooks said, why not shoot this one? Is your intent to build a completely new gun, but copying this original?
I see that you are a new member to the forum, are you also a new person to the gunbuilding trade? If you are, you have no idea of your undertaking. As for copying the stock you have Fred Miller, Jacks Mtn. Stocks, Dave Keck, and probably others who could do that....but, where do you go from there? Where are you going to get a set of matching
barrels, locks, and hardware...just food for thought............Don