You can also 'improve' the wiring by soldering the tap wires of the neck PU to the other side of the DPDT, like it's already pictured with the bridge PU.
Then you'll also get the
neck pickup in single coil mode when the pot is pulled, if that's what you're after.
And don't forget that the colors of the leads will differ when you're using Dimarzios instead of Duncans!
btw, that's a pretty weird
toggle switch they used on the diagram, hmm.