So I'm building an electric solid body 5 string mandolin (13.5" scale) as my first build. Because plans/blueprints for such instruments are few and far between, I've had to figure out most of the design myself as well, adding to my woes. Currently, I'm trying to design the neck tenon for a set neck join, and I had a couple of questions that you guys might know the answer to.
Is it fair to assume that the longer I make the tenon, the shorter the "lip" forming the heelblock of the neck needs to be? (sorry, my vocabulary is probably all wrong)
Also, from what I recall, the mortises and tenons on builds that I've seen seem to have rounded corners, rather than ending in sharp 90 degree angles. Is this a matter of preference, or does this add to the strength of the join in a significant way?
To give you some context, right now I am planning to have the neck attach at the 10th fret and have the tenon extend all the way to the end of the fretboard (20th fret) (dimensions of the pocket are 1.25" x 3.25").