Hmmmnnnnnnnn...
When I built my yeager to harrison's Fruwirth drawing I thought the barrel was 28 inches. Oh, well. I ordered a 28 inch swamped barrel from don Getz, waited eight months and received the usual 31 inch heavy yeager barrel. I decided to go ahead and build it anyway. Later I was glad that barrel was 31 inches. The yeager I built was the sweetest handling gonne I have ever handled, barr none, even modern guns. I tried to build it as faithful to the drawing as I could (thinking of course that the barrel was 28 inches). However, I did not engrave it. I simplified the tang of the buttplate so I could inlet it with my amateur skills. Also I simplified the carvings because, a. I didn't have the skills, b. didn't have the tools, and c. didn't have the european walnut that fruwirth did. But I was impressed by how well I did build the gonne because of having a full size drawing to follow with all four profiles and side drawings of various pieces of the gonne.
Just before I moved to Mexico I made sure that just the right man got that one, because I wanted it to be fully appreciated. It is.
The investment for the drawing, which I still have, was worth far more than what I paid for it. I highly recommend buying the drawing if you want to build the rifle.
volatpluvia