Ralph and Carter, as in Ralph and Carter Stanley, the original Stanley Brothers. But Carter was named after the Carter family.
From Coeburn or Norton Virginia, depending on what mood Ralph was in when you asked him
They had a fellow named Ralph Mayo do a couple stints with their band, on Fiddle and Guitar and I think maybe Bass too. He sometimes claimed to be from Kingsport, though he also claimed to be from Rome Georgia (got lots of friends from Rome Georgia myself)
Hope your project works out well for you! Keep us updated, and I'm sure the fine folks here would be more than happy to help you out with any questions.
Get together a Hog roast and they'd probably come down and build your building for you