You asked about the checkering. My sanding barely made it to the double borders on both sides.
I also reduced the height of the nipples to allow the hammers to cup the fences as they should.
Must be careful the mainsprings don't travel below the lock plates, though, or they will split out the
wood under the locks. I also did a little remodeling on the breeches, in front of the fences.
As you can see in the top picture of my post above, the un-modified hammers sit quite high above
the fence which eliminates the fence's actual function of preventing cap fragments from flying back
towards your big shiny eyeball.