Sheepdog posted this thread "Testing out pickup configurations.... (warning: slightly crazy)" which is in this forum. It's basically about routing out under the strings to test different pup configurations. Something I'd been thinking about for a while but the post got me motivated and I've gone off a bit on it. My progression of insanity can be tracked by reading through that thread if you're interested - not a long thread and may make more sense in context. But it's taken me to the following (an excerpt from my last entry) and somebody's bound to have done this or had some exposure to it. Years ago I ran across a shpiel and know Hagstrom made some guitars that had quick change pups in them cause I'd already thought about it and wondered why nobody had done it. I'm primarily interested in other peoples experiences but feedback in general may produce something of interest: ... started thinking back to routing all the way to the pots and mounting pups and electronics into a blank that could just be slipped in below the strings and screwed in place. Then it occurred to me that if I did that, instead of having a bunch of basses, I could have a bunch of these mounted electronics and just a couple basses. I could make a portable case to store and transport the electronics. Talk about a flexible rig.