Well, I've got a Mexican P-Bass with EMG's and the battery is VERY snug in the control cavity, often almost impossible to get the wires in after replacing the pickup, along with 11 or so screws, it's just a pain in the butt. How does one drill for a battery box in the back without hitting the control cavity? Are there any tricks to making sure it's level? I'm looking to use one of the Gotoh-type pull out battery boxes in just about the same position as the one found on an EB Stingray, how does one go about that? Without damaging the finish?