I started sleeving the 24pin ATX last night, but I find sleeving to be a very slow process.
I also needed to resolve the fact that 2 pins from the PSU go into a single one on the motherboard side, and also there is a pin missing on the motherboard side.
So I have added a plastic cable joiner (you know the ones with a couple of screws in that allow you to attach cables togeather, heatshrunk over it, and it will hide behind the motherboard.
I have also added a false pin which I will heatshrink to another one behind the motherboard tray.
It will probably take a couple more days for me to finish this off as I'm not at home tonight.
I was going to use the 4+8 pin extension that comes with the motherboard, however I have re-pinned one of the PCI-E cable to match the 4 PIN and remove the extra pins (else I would have had to use the above connecters for 4 of the cables instead, which i am averse to doing), so it makes more sense to use 2 cables from the power supply instead.
Then later I will do the SATA cables and the 4 pin MOLEX connector.
I'm still uncertain if I'm going to resleeve the fan cables, however I am doing the Aquabus connectors as the sleeving is really loose and you can see straight through it.