This one went through a long and torturous build process over almost two years. All I can say is don't believe the "advice" you find on talk_ass. However, in the end, it turned out to be a pretty nice instrument.
These three pieces will go together as shown to make a very strong angled headstock. This construction, known as a 'scarf joint', sandwiches the headstock between the neck and the fretboard. Unless the glue fails ( which has been known to happen ) this joint will never break. It also has the advantage of being very economical, as the neck piece only needs to be as wide as the neck, not the headstock. You can use 2-1/2" (3") lumber for the neck and 5-1/2" (6") for the headstock.