I could go on and on with endorsements. The thing is to look at people's work and see what appeals to you. There are a lot of great builders of accurate re-creations of specific PA makers work who have not been mentioned yet and who contribute to this site in addition to Mike who has chimed in. You would do well to look at Ed Wenger, Eric Von Aschewge and Mitch Yates. In Canada, Taylor Sapergia comes to mind. Not sure how much custom work he is taking on but Tom Caster also does very fine re-creations of PA makers work. Jim Kibler is able to work in any school and stun. Probably just depends on what would excite him, as I see him working across a wide range, perhaps wider than any other.
Some seem to specialize more than others. I'd likely go to Mr. Caster for a Beck, Eric V A or Allen Martin for a classy Lehigh, Eric Kettenberg or Mike Brooks for a folksy aged rifle, Ed, Mitch, or Taylor in addition to Bill Shipman who I mentioned above for a full on, well engraved and carved Golden Age piece.
The makers already suggested as well as Mark Wheland are excellent choices of course. I Rudy believe we are in a new Golden Age of the longrifle, as far as talent and in depth knowledge of originals are concerned.