Hey, I have to disagree the diagram is wrong... using seymore duncan wiring codes in position 1 the output from the south coil of the bridge humbucker is connected to the ouput of the north coil of the same humbucker ... neither of these are connected to the output ... in fact the only coil of the bridge humbucker which is connected to the output is the input side of the north pole of the bridge humbuker.. and this is connected to the output in parallel with the P90 ouput... all other switch positions are also incorrect
if you want I could draw up a diagram tomorrow sometime that would achieve what you want using the 4 pole 6-way when I have more time
Steve