(263) Is There A Doctor In The House?

This is a photograph of my paternal grandfather's year group at Glasgow University School of Medicine, c.1923 
I assume the group picture has been compiled from individual portraits that were printed, cut out, arranged to show everyone in the group, then photographed to give the final image. If so, I imagine that would be quite a laborious task. 
My grandfather (3rd row from back, 6th from left) went on to become GP and was well known in around the town of Burntisland. Given my aversion to all things medical, I clearly haven't taken after him in that respect.