Hi Rolf,
As I mentioned in your other post about this, Beck may not have cased the pistols. He was a rural Pennsylvania gunsmith and as such he may not have had ready access to cabinet, case, and accoutrement makers as the Europeans and urban Americans did. That said, your beautiful pistols deserve a fine case but why not consider how an 18th century gunmaker might have handled your pistols and build a vertical case. I will gladly send you what few photos I have of such cases. I think the format would be wonderful and give you the chance to explore high quality cabinetry. Take it from me Rolf, it is fun!!! I realize such a case would not showcase the pistols but cases were for travel not display. Think of the possibilities of using a beautiful figured North American wood available to J. P Beck like cherry, oak, or maple. Then have an upper tray above the pistols with a small horn powder flask, bullet mold, flint whisk, and brass oil bottle, all made by hand. It would be so different than the norm and so wonderful. If I had your pistols in hand I would build it for you and enjoy every minute.
dave