Talking about a joint here means the connection between two different wooden parts of the instrument: the neck and the body. It is a very important item covering strenght and stability. The body is tilted 4° backwards and 2° downwards according to the neck’s axis. This doesn’t make it more easy.
Day 13 & 14 : Working on the neck’s backside profile. Drawing the second cut’s borders and removing the wood. Drawing the neck’s inside borders and cutting out the wood with a gouge.
Day 15 : Continuing the neck’s cutting out.
The neck’s backside is now made of 7 surfaces. I didn’t touch the border between the neck and head to be able to clamp the piece.