I assume you are talking about the sides when you said walls?

The thing that's puzzling me at present is how to get round the problem that the walls of the mandolin aren't an even height all round - they range from about an inch and a half at the fingerboard end to three inches, and not a straight line either. Very elegant, but tricky

This is why I like the mold. Between having the side dimensions and the shape of the pieces, you can make an excellent little mold. A bit of time, but worth it.

Spaw