The entire back, sides, neck and pegbox are carved from a single solid piece. The only glued on parts are the soundboard and fingerboard!
In this shot you can sort of make out how the sides were carved out before the soundboard was added:
In jarocho son music, the rhythmic strumming is very important. This type of instrument provides rhythmic strumming, and chords, while other instruments and singing would provide the voice.
I love seeing how instruments are built suited to a particular style of music.