Re: Patent protection?
In the huge, huge and fiercely competitive guitar market, you will spend thousands of dollars on attorneys and patent searches, and patents only to find out that someone in the industry has already come up with your idea, and/or (most likely) no manufacturer wants or is willing to pay you for your idea.
There is such a thing as ideology or fantasy, and then there's reality.
Start building your idea and selling it yourself and keep your head in "reality". But realize that if you do all the aforementioned legal stuff, you NEVER will "turn it into a profit".