How will you sleeve the cables and in particular the 24-pin? Will remove all wires from the connectors? 1/8" might work for smaller cables, but you probably need 1/2" or 5/8" for the 24-pin cable. The smaller the sleeving, the more difficult the task will be.
I checked a couple Antec cables that use the following sleeving size:
6 and 8-pin cables: 3/8"
small cables: 3/16"