Rolf, here is a Dixie Gun Works "extra fancy Patchbox", from their 1993 catalog. Somebody gave me this stock and I will never use it. The box is 10 3/4" long, .160 thick , 2 7/8" wide and weighs 10 ounces. It could be made to look lighter by sawing the piercings a little larger. Those large countersunk screw holes could be filled in with brass and smaller screws located. It wouldn't work for a left handed rifle, but if you want it, I'm giving it away.
Here shows the inlet and butt plate- 3 3/4" tall.
And the stock, inletted for a "Kentucky percussion lock". Barrel channel is 13/16" by 42". No cracks in the stock, but no other metal parts than shown.
I will give this away for the cost of mailing, you have first dibbs if you want the PB, or all of it.