Modifications

I made some modifications to the mold. Like I said the layers of chipboard are only 8 mm thick and one of them already cracked a bit. I decided to glue two layers together and the third one was strengthened with a layer of 4 mm MDF. That did the trick.

The bottom layer is still one layer but since it is solid it has more integrity from it's self.
In the top layer I added nut inserts all around the mold. Into these nuts I can screw bolts with pieces of wood which will act like clamps later on when the top and back will be glued on to the body.

And completely taken apart:

When the ribs (sides of the body) will be bend I will need another mold which will clamp the ribs for a period to let them settle in to there bend form. This mold was made out of two layers of 12 mm MDF glued together. The profile of half of the body is then cut out.

 To conclude this post a picture of the zebrano set which I will use for the top, back and sides: