Roger, It certainly makes you appreciate these magnificent old buildings more! From first draft to the final stone, given what tools/instruments they had at the time. Imagine the maths; fractions using an abacus
Peter, sounds like a local authority project! Imagine the stone masons crying with laughter Monday morning, oh well another seven years work lads.
Bob,
TomDC, I'ts great to see what others can achieve,
John