By doing one bulkhead at a time and test fitting with a piece of timber, we were able to ensure the angle of each notch is right for the path of the stringer, with no huge gaps.
Once we were happy with the notches in the rear four on both sides, we glued the stringer in and clamped it overnight, before finessing the notches in the bow. This was mainly because we don't have enough clamps to do two stringers full length. Here's the aft port side all glued up and clamped.
Barrett Faneuf was all fancy with her transom, and used a saw to cut the planks edgewise into thin slices. I have no saw. What I do have (thanks Dai!) is a thumping big router with a 25mm bit, a huge hand plane, and a whole lot of
After a couple of days of going at it with the router, I had a really rough surface approximately 6mm thick, which I could then plane smooth. This I did with my awesome English Stanley no. 7, the smootherator.
Putting the doubler on the transom gave me another opportunity to use all my clamps at once.