Please feel free to share. “Game of Thrones Group Project”
The ribs are the vertical part of the sides of the violin that separate the top of the fiddle (with the F holes) from the bottom of the fiddle. Whether they want the measurement of the ribs only or the thickness of the violin (including the top and back) I can't say. You'd have to ask them that. Here are the parts of a fiddle.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. ~Herm Albright