Rodger Hargrave is as far as I can tell, not just an expert, he is the expert. He makes violins, really good violins. As far as I can tell, perfect violins. But that is not all. He has a quick wit, amazing skills and serious expertise. All this and he has gracefully shared his methods. He is generous enough to banter with the likes of me on Maestronet When he is not earning a living producing masterpieces, he often shares his knowledge in detail and generously. So if you want to visit the best, then by all means go to his website.
But the real meat of this post is that he has recently made available his book detailing the making of a double bass. This is the real deal given freely by him under Creative Commons license, here is the link to his library. So if you want a detailed walk through to building a true master work, here it is. A master work detailed by a true living master.
The read only version, in PDF form.
The Version for printing a Book, also provided in PDF form.
Roger Hargrave requested help in distributing his book. Who am I to protest!