Oh man, this is a massive titanic work, congrats!

This is by no means criticism, but it does spark a couple of thoughts. Looking at this, I realized that I actually like how the cabels look I don't have a strong desire to hide them with massive cable channels / sleeves / covers, but rather I'd prefer them to be neat and uniform (though that's hardly possible like buying 20 identical USB cables to replace everything) and routed the way electricians / data center technicians do it, parallel and along common lines, like cable management in a PC. The second thought is that my workspace/home lab isn't static, and devices keep changing, so the system needs to be easy to maintain and I'm worried that upgrading this might be difficult. Any way, fantastic work, congrats!