Cables:
The only custom cable we use on the bikes is the extended speedometer cable (included in the complete kit). All the rest are stock. The front fork lowering mod and clip-ons will create excess lengths of cable, but you can get creative and make them look good. Zip ties are really useful, especially the ones that un-zip.
The main challenge is the brake line. On my bike, I clamped it a little lower with the stock cable clamp and then tucked the rest between the forks behind the headlight. It's hidden pretty well when the tank is on.
You can use the stock horn mount bracket as an attachment point for some cables. And there are some other tricks for the wiring harness. Ryan will be demonstrating how to route all the wiring and cables on the build video. But there's many ways to do, no right or wrong.
Here are some pics from each side of my bike: