You can have the same issue trying to fit routers to router table insert plates. Since you are building guitars you may want to do inlays at some point and to do that you'll need to get and use at least a couple sizes of guide bushings. You can use the guide bushings and the plastic base plate to locate holes that you drill yourself in some cases.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.