I have now built 2 stereo baritone guitars. One, this cbg, and the other is a modified Fender baritone electric. The CBG was way easier to build since I could create the room I needed for the wiring, plug, pots etc.
Each pickup has 5 wires. The guitars are split down the middle, soundwise. Strings 1-3 go to a guitar amp, strings 4-6 go to a bass amp. Each side needed to be boosted with a Fulltone pedal due to low pickup output, even when the volume controls were floored.
Free CBG advice: start with a hardwood box. The redwood fruit box I used was fragile, so I added hardwood structure inside. But I also drilled out the neck-through plank of oak to lighten up the axe.
To me, bigger boxes look better, Mine is 11"x16.