Sleeving and building wires

Hi all,

So I am currently sleeving my modular power supply (I am going to post a build log when done)

anyway I'm noticing that the wires cross so for example on the cpu end the wire might go in the top right hole but at the connector at the psu it might be second from the left, The connectors are identical I just want to be sure so that it won't screw anything.

Also I'm a few connectors short and I can't source them anywhere so I'm thinking of building my own modular cables if anyone has any information on this it would be greatly appreciated