With respect to that 1.65 inch thickness. I have a decent English pistol by John Richards, Strand, London, H.L. Blackmore says from 1778--1780. Using calipers I measured it to be just 1.5 inches thick at the rear of the lock panel, which is the widest point. Not a duelling pistol but fits the hand very well & has the lines of a good dueller.
There is an identical Richards on
www.horstheld.com Scroll down to "makers R", and it is the first gun, at least tonight it is.
If you wish I can measure the width of barrel at breech on mine, haven't done that, to see how it corresponds to the barrels you have.
I am not a wood expert but I sure do like that you have laid out the stocks so the grain runs in a decent direction in the grip, for best strength.