I haven't been following but if Lutro0 is out of business that's unfortunate. He was a legend in sleeving.
MY cables were custom. And yes it was a pain in the ass. It was my first time doing custom cable, and cable management for this build took about 20 hrs. if I knew what I was doing and was proficient at it, I estimate that time can be reduced down to 6 to 10 hrs.
Cable management is very time consuming, but it makes the build. Technology goes obsolete, but craftsmanship is eternal. My second foray into custom cable took just as long due to space limitations.
With things like this you are always looking for a new challenge.