Had a crack at shaping the neck and now know why everyone uses CNC to do this stuff, took most of the day
Rough shaped the main neck area down to 24mm to get the basic profile I was happy with and then worked on the transitions to the headstock and neck joint. Did some more shaping and got the neck down to 22mm at headstock end tapering down to 23.5mm at the joint end. Measurements are with fretboard unprofiled so may drop a little in thickness once thats done and final sanded.