I spent a lot of time looking at doing one. Honestly, in the end, it was just more cost/time efficient for me to go with a pre-made setup. I have the central command on one Jeep and will likely go with a switch pros unit on the other Jeep to mix things up a bit.
I have one that someone made me. Wires are hanging around and just looks sloppy. I’m to lazy to clean it up honestly but it works. Cost wise I saved maybe $50 compared to a premade kit from one of the big companies. In the end building my own wasn’t worth it
I put a distribution bus on the sidewall left of my dead pedal. Allowed me to run a single larger gauge wire to the battery and connect smaller diameter accessory wires inside the cabin. It’s worked well.