For what it's worth (probably not a lot!) my great grandfather James Paterson was a Master Mason, and family has been in Dumfriesshire for a long time. He was born in Johnstone (or Johnstonebridge, it gets called both) in 1818 into a agricultural family but was listed as a Mason in the 1841,51 and 61 census, although he was also a farmer, and later Roads Surveyor for Upper Annandale. I get the impression that Agriculture and Masonry went hand in hand, and wondered if in such a rural area that was normal?
Good luck with your search, both of you -