I'm toying with the idea of replacing the pickups and preamp in my thumb. 1. I have'nt really decided what would sound best, 2. I have'nt got the dimensions on the stock pickups. Anyone have any ideas on either of these? I've been considering going either fully basslines or emg but do not want to do any routeing at all. Is it possible to use the basslines "slap contour" preamp with my bass with out routeing anything, would it be a good idea? What options do I have without any wood work?