So you're going to make a violin. The model you choose, the size, outline and arching of top and back, will pretty much determine the sound character of the finished instrument.

Once you have finished the arching, you know quite well what kind of sound the violin will have.

The length and shape of the f-holes will also influence the sound a bit.

But when it comes to the thickness of the top and back, bassbar and so on, you don't really influence the character of the sound, but the response, playability and sound volume. That is, the way the violin performs, and that is what determines if it's going to be a professional instrument or a mediocre one.
More on this subject another day. And more on what influences the character and quality of wines of course.