I have done the dovetail joint now, the socket on the soundbox was done with the router, using the cutting template in the picture below. The neck was carved by chisel once the large waste area was cut away with the saw. The small steel plate in the picture is screwed to the neck end and used as a guide for carving the joint.
The dovetail joint was much easier to do than I thought it would be. As I got closer to a neat fit it was a case of sliding the neck into the joint to check how well it fitted, a case of remove little and check often. It comes out at about 2 to 3 hours work, not counting making the cutting templates.
The next job now is to carve and shape the heel, the heel on this guitar is not going to be the standard shape heel for a classical guitar but instead is inspired from the heel on a selmer maccaferri guitar.
I am becoming a lot more experimental now and will be trying various other ideas on future guitar builds.