Chalie,
I am in agreement on the body thickness issue for most non-series basses. Traditionally, they are not build deep enough for the series electronics.
Wolf,
Sounds like a total head bender for me. I'm a pan control guy and have bought and consequently sold every Jazz bass, T-40 or any other dual V/V bass I've ever had. It just doesn't work with my brain for whatever reason.
If I had the money to build a custom, it'd be a Series bass with Master volume and pan (ala SWood's custom series basses!)