I've got a P-bass that came standard with one of those gold pickguards. In time I bought a black pearloid one and just put it on top because removing the gold one screws with the grounding. Anyway, I decided I want to carve some designs into the black one and have the gold come through underneath. Maybe some tiger stripes. I don't want to have to cut in from the sides if possible. What would be the most effective way to accomplish this without it looking like crap?