I'd like some ideas on a guitar that is easy to swap pickups in. I'm having fun with my winder I built, but, it's a PIA to swap out the pickups for testing and play. What are some designs that might make a good test mule guitar? Can they be loaded from the back? What would be handy is a way to do it without removing the strings. Testing all of them in the same guitar would be good for evaluating the differences. Ideas?