Speaking from experience, I have a pistol I’ve taken down a similar road.
First the frizzen needed to be hardened, later a new bridle fabricated.
Then through inexperience and stupidity, I broke my own main spring.
Needless to say, Cascabel is pretty familiar with this pistol now. . .
Some years later we did a major tear down and rebuild of the piece. Cascabel retouched everything, tuned the lock and tweaked as needed – beveled the lock plate, moved everything over to a restyled gun stock . . .
Considering all the modifications I’ve done over the years, I’m afraid to think what I’ve spent – but it is easily several times over the $250 I initial spent on the pistol.