Thank you so much for your prompt reply, George! Just what I wanted to hear!
And, Ken, I'm just twice shy now because I used that "Well, this is number 217, so the builder must have known by then what he was doing!" logic on a fairly recent purchase online, only to discover that the instrument was well put together but is completely unplayable. But as I write this I am realizing that the instrument I'm talking about does have a fret board that extends off the end, so perhaps warping has robbed it of any good intonation. . . .
Back to the Blevins --I could only find an obituary with a fleeting mention of being a dulcimer maker and one comment on Everything Dulcimer (aside from Dan's comment below). I'd love it if you could post a link if you've found more info. Thanks to you both!