Amost no one ever builds from scratch, not now, and not then.
What you are doing as a wood worker is becoming a stock maker, and will buy a lock, barrel and furniture. These other 3 items were also specialized back then. Lock, stock and barrel, leaving the furniture left out.
Today there are still stock makers, lock makers, barrel makers, and furniture makers.
Some builders do more than one of these, but it is rare for a builder to do all of these. I have dabbled in all of these and build one gun from almost scratch, but I bought lock parts and some furniture. I altered these to be what i was after, circa 1740/1745 all ideas I got looking in musems and books.
What I got is a English Naval officers pistol, just after the Queen Anne style.
A walnut stock (my own), with a brass barrel (my own from solid brass), lock plate, (my own) steel lock parts by Siler, The brass furiture as a dragon side plate, and ferruls (my own) Trigger guard from Dixie, and a brass long ear pommel from Dixie.
This pistol took all my spare time over 90 days. So far this is as far as I have come to "scratch".