Hi Runastav,
Looks like a great project but Scottish pistols from the mid 18th century have many details that are not incorporated in the reproduction that you are using as a model. First and foremost, the vast majority of Scottish pistols used the "highland" lock, which had a lateral sear mechanism. The trigger was pinned high in the stock like a those used for snaphaunce locks. The trigger was made with a silver ball rivetted to the trigger bar. Often, the top of the trigger bar actually protruded through a slot on the top of the stock. The best guns were heavily engraved and often included silver wire inlay in a woven Celtic design that showed beautifully when the stock was fire blued. You might want to buy a copy of Martin Kelvin's book on Scottish pistols, which describes many of those details.
dave