Runar, one thing that the Sauer & Sohn needs is a semi-circular piece of flat silver directly in front of and below the nipple. Those firearms with nipples standing out in the open almost invariably have said piece of silver (or maybe German silver?) in place as the semi-exposed nipple location causes a lot of damage to the wood in front of and below the nipple and it's propensity for throwing both powder and metal debris onto the wood. Make the radius about 1.5 cm.
I currently have several of the BA locks; one in particular is going into a .50 cal pistol, replica of a John Deringer. I have the stock cut out of English walnut, and the barrel inlet. Lock will be inlet next.