I'm currently modding an Ibanez P-Bass and I'm thinking about putting a Bartolni MM "Classic Bass" into it. However, the bass's current pickups are typical P-pups so to install the Classic Bass, I'd have to re-carve the holes. I've never done anything like this to a bass before so I was wondering if anyone has done anything similar to their bass in the past and if so, would like to share some advice? I'm mostly worried that if I start carving into the shell where the pickups are, the rest of the body's shell will crack. (Like when a pond freezes over and it breaks in the middle, the rest seems to crack as well.) PS: If anyone wants to suggest a different pickup that may be easier to replace/fit better/sound better, I'm open to ideas.