One of the fun things about building electric guitars is wiring them up. Factory wiring tends to be simple, minimizing the amount of fussy handwork required. Many manufacturers keep strictly to 'classic' designs, seldom if ever changing anything. These designs are generally simplistic, often crude or even stupid, and sometimes outright flawed. There is no need for you to do this. I don't. Here are some of the things I have done over the years. I don't claim to have invented any of this, although some of these schematics I have never seen anywhere else, and had to derive them myself.
I started putting together the Kubicki guitar. So far, just simple mechanical stuff: tuners, bridge, pickups, etc. In this picture, you can see how the wires pass through the battery compartment and everything collects under the bridge pickup and then goes into the control cavity. Soldering tomorrow.