For cable sleeving in this mod, i used two kinds of sleeving.

For the main components, like the board, the video cards, the hard disks, etc etc etc, i used shower hose. Lots and lots of shower hose:

For the less important components, like LEDs, the fans and things along those lines, i sleeved the cables in 1/8" thick clear TechFlex sleeving, and then that was sleeved in 6mm clear tubing. I had to import the clear TechFlex from the USA as it was not locally available. Here's the Techflex:

I imported 225 feet of it. Here's just a little bit:

After it was sleeved in the clear tubing, i had this result:

This is was it looks like in the finished mod: