I originally wired mine with stacked volumes, but found it too easy to have the wrong knob turned down in series mode. So I redid it a blend pot in the tone position. Then used a stacked knob for V/T. I usually prefer individual volumes, but with a series/parallel setup, I prefer the blend pot. It just feel more intuitive to me.
The web is littered with diagrams to wire a blend pot.
I don't have a schematic for you, but I wired my Jaguar for stacked VV. Like JoeWPgh said, I would rather go with a blend knob. IMO the "favoring neck/bridge" settings really weren't all that useful. Also remember the control cavity is tight! I ordered one of those big stacked pots and I had to reverse the order of the V/T pots to make it fit.
Finding a pot for volume/blend will be challenging, as such wiring requires a concentric, triple-ganged pot with an odd combination of tapers. Unless you meant a concentric pot for volume/volume, in which case, people do that all the time.
