Time to get the "thicknessing jig" back out, as I also use this to cut the first angle onto the top. I used 4 degrees, which will now also be the neck angle, and mortice angle. I set it up by raising the back end, while the front end is clamped until I get the 4 degree angle. I use two straight edges and an angle tool to make sure I am at the right angle on each side.
Then proceed to cut the angle up to the point where the fingerboard will end.
