I'm no expert on checkering but I had her match the original "skip-a-line" (is that a collective groan I hear?) checkering on a 20 guage Savage/Valmet 333 replacement stock recently and I must say it is precisely like the original (more groans?). I got what I asked for at a very reasonable price, when they said it would be done.
I've had other, non-shotgun work done by Ahlmans and been very satisfied with the price, schedule, and workmanship. (They can even make your Ruger GP-100 "less than ugly"!).
Ahlmans seems to focus on the work and the customer, not on whether "somebody might sue them some day about something." Refreshing, and rare.