Before and after. The unshaped neck for one of the other guitars and the almost finished neck for the '59 replica. Yes, it is a long tenon.
Between this picture and the next one, a LOT of sanding and shaping went into preparing the neck to be joined to the body. I used a hard sanding block, varying grits, scrapers, and occasionally a quick shot with the rasp to shape the contour. A light and a straight edge were used to keep the contour consistent. I made marks where there were high spots and worked them to shape. Rolling the neck with a light behind it revealed high spots as well. Also, just like the top of the body, I had to feel it with my eyes closed as the eye can play tricks. Once everything was true, the neck went into the body.