Your right about being a nightmare. I was hoping that someone with as much experience like your good self might have an easy answer for me but it looks like it's the hard road of trying to lay the harness out and joining the dots with the schematic.
I'm afraid so. Don't forget to tie some dental floss to the pot shafts and the pot washers before you pull the pots. It makes life a LOT easier when it comes time to put them back in.
Oh, and I think this was over by the seventies, but back in the fifties and sixties, Gibson had a bunch of women in the factory who wired everything on 335's and such through the F-holes. Just imagine what happens when a hot soldering iron touches celluloid binding!