On my '91 360WB FG, I added a white plexi TRC with trimmed and polished edges, made new, matching, back-painted guards, also with polished edges, put a toaster at the neck position and a high-gain modified to take a toaster cover in the bridge position and ran them through the standard 5-knob system to the normal mono output jack. Then I added a middle toaster, added a sixth knob to serve as a volume control for it and ran it all by itself to the other output jack. Using a Y-cord, I run the two outputs to different amps or amp channels (usually running the neck/bridge circuit through a JangleBox first and the middle circuit straight in) blending the two circuits to get the mix I want. If I don't want to mess with the stereo thing, a mono cord into the normal jack gives me what is essentially a normal 360/12. Then it went out to Dr. Arnquist for treatment of my fat-fingertips ailment. He replaced the wimpy truss rod bar (which was digging into the wood) with a vintage-style aluminum block, carefully-shaped to fit the hole properly, added a twelve-saddle bridge after deburring it and shaping the saddles to eliminate rough, sharp edges, repositioned the bridge plate for better intonation, centered it properly with the neck and de-burred the underside of the R tailpiece. Then he pulled all the frets, stripped the fingerboard, re-fretted it with frets all the way out to the edges of the binding for maximum finger-room and replaced the nut. The new nut has pretty close spacing of the pairs and uses as much neck width up top as was available. For me, it made a huge difference in playability. Recently I switched the pot for the sixth knob (middle pickup volume) with a push/pull pot and the jack with a switched jack. John Allgaier helped me by assembling a copy of the old Vox treble booster circuit from a diagram I found and we tried installing it inside the body to see what it would do. We used the input jack switch to turn the battery on and off when a cord was plugged in or removed and the push/pull pot would turn the booster on or off. Everything worked great except the booster - which, as rumored, was really aggressive sounding in a nasty sort of way and not very useful. I may try sticking a little on-board compressor or some other effect in there to replace it. Other than that stuff, the guitar is completely stock
It's probably not everyone's taste in Rickenbackers, but it looks great, plays great and sounds even better. If I ever get run over by a bus or something, you will want to bid on this guitar.