A fowler is a SMOOTHBORE, Buzz, Not a rifle. Fowlers often come with Rear sights, so they can be used LIKE A RIFLE to shoot PRBs, but they remain a SMOOTHBORE. Tom Grinslade's Book, " Flintlock Fowlers: The First Guns Made in America from 1700-1820 was published in 2005By Scurlock Publishing co. Its the best reference book in print today on ORIGINAL Fowlers.
As to a modern builder, I hope someone else can help you. I do not recognize the name. Track of the Wolf sells a lot of guns on consignment for builders, and they would be one source I would call to see if they recognize the name. The other would be Dick Greensides, at Pecatonica, because he sells pre-carved stocks, and stock blanks to builders all over the country. Dick might just know the man you speak about, and can give you information about how to contact him.
I hope this helps.