Thanks Jim -
I am not seeing the sort of anticipated possibility that had me asking after them - Though nor am I seeing the empty joinery typ to a re-purposed frame or one built with recycled framing.
The only empty/recycled joinery I see is the Bridle Joint (Tongue & Fork) which carries the rater extensions - This is typ to area ridge rafter connections - And the empty Purlin pocket the female side has which is typ to Ridge Purlins.
Gotta admit my curiosity is up - My ride soon shifts from treks to a Campton bridge rehab, south to Candia, lets figure out how to meet up there in the barn - PM me and we'll work out the wheres & whens