I just picked up a Martin in poor shape. There is a hole in the waist on the treble side and it didn't come with the missing mahogany. It did come with a bunch of spakel pasted all over the hole. My thought is that I will make a patch is the shape of a baseball diamond to fill the area. I thought of this because I have the idea that repairs of this sort are better hidden when the patch does not run perpendicular to the wood grain and with the baseball diamond shape all of the lines would be angled. Please see pic #1 to see the poorly drawn shape I am thinking of. Another issue is that a whole lot of finish is completely gone. I do not want to refinish the guitar, but perhaps it is necessary?? There isn't any finish on the back of the neck and it is spotty throughout the body. I do not plan to sell this guitar, so resale is not a concern, but I don't want the guitar looking brand new, any thoughts on what a french polish might do this this guitar?