Hi,
Great thread!! Thanks for sharing. If you are going to use a Pedersoli Bess lock on which to model the internal parts, I urge you to cut the full cock notch on the tumbler about 1.5mm closer to the half cock notch than it is on the Pedersoli. That will shorten the ridiculously long throw of the flintcock on the Pedersoli lock, speed it up a little, but more importantly, substantially reduce the chance that the sear will get caught in the halfcock notch when firing. Original Besses had very heavy trigger pulls that eliminated that problem but if you want to adjust the trigger to a much lighter pull, you may find the lock hangs up at half cock when firing. Even if it does not hang up, you may notice wear on the lip of the halfcock notch after you have fired a few dozen rounds.
dave