Just note that the Pit Bull wiring diagram you found, https://www.pitbullguitars.com/wp-co...s/pdf/IB-5.pdf shows the bridge pickup's output wire ground running off to the back of the neck volume pot. Absolutely no need to do that and I'd wire it to the back of the bridge volume pot. The backs of the pots are all linked to ground and running the pickup ground to the back of its associated volume pot is a standard way to wire the pots up.

Also note that the Pit Bull diagram omits the red blobs indicating that the folded-back tab on the volume pots should be soldered to the pot casings. You can also use a wire link if you like as some types of pot tabs aren't long enough to fold back and touch the casing (which is grounded). But those folded volume pot tabs must be connected to ground for the volume controls to work.

It should really look like this:

Click image for larger version. 

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