Definitely as a luthier -- a violin made by a skilled luthier (not "top of the profession", but "a decade or more of experience doing this full time") is typically in the $10-40k range and if they're not doing repairs (which can also be lucrative) a luthier working full time hours can make 8-16 good quality violins per year.
Of course there's a bunch of expenses to be accounted for, but it's definitely still in the category of "six figure income if you're good".
Agreed that it's a narrow specialty. I think being a skilled (and careful!) woodworker is the primary prerequisite though; many luthiers have little or no musical talent (which may go partway to explaining why instruments are valued more on the quality of workmanship than the quality of sound they produce).
Of course there's a bunch of expenses to be accounted for, but it's definitely still in the category of "six figure income if you're good".