Oh yeah - that's nice - for a change of pace. I think one should keep the lines quite English for the comb and heel so it mounts like a shotgun - sights all lined up. Go slow and try for fit often while shaping the butt stock. Will be nice.

To me, it appears the comb is perhaps 1/4" too high, and the heel 3/4" too low. The beauti of the design I note,is that is points like a shotgun, sights lined up. Of course, different physiques demand slightly different measurements. Have you handled the gun in the picture?

What wood?

The hammers are especially nicely carved - the dophin head(or whatever it is) was quite popular - on English guns too. They are nice indeed.

It shouldn't be too difficult to shape the fences as in the picture as there is usually a lot more metal than required.

Keep in mind, although these guns kick a bit, the actual pressures generated are quite low compared to a little .40, .45 ro .50 cal. RB rifle. I am certain that is why many larger bored guns have much thinner barrel steels in comparrison, than smaller bored guns. To get the pressure up over 10,000PSI in a 14 or 12 bore takes a LOT of powder - more than any normal man will shoot, yet most normal 50 and 100 yard loads breech that pressure by 50% in the small bore RB rifles & by up to 300% when shooting slugs.