I used the heel of the baritone neck to make a template of sorts, so I could line it up on the plug I put in the neck pocket. That's it on the paper in the foreground. I also found and marked the centerline.
Then I cut a big V in the paper so I could match up the centerlines.
Then I lined everything up with a neck plate and scored where the neck mounting holes will go. This will help me find where I need to chop off the neck pocket.
And here we go, neck pocket marked out for future cutting and drilling. I won't have to reshape the body all that much once the cut is made on the thick line.