Thanks for the comments,

but what are the "pots"? Do you mean the three thingies under the strings? When I measured those with my a ruler now I actually see they are too thin...have to scale those. I've measured most parts but forgot a some.

You're right about fingerboard, it should be a separate piece. But since that's only visible by the texturing (you can't even feel it) I will fix that in texturing when I create the textures for real. I've just applied a random wood texture for now.