Rogue Leader :
I wouldn't be embarassed by the cables back there, thats prettymuch most systems, unless you are able to custom cut and fit exact wiring there is no way to make that look good with varying length cables. You just hide it as best you can.
Some of them are custom made, for this build, most are reused or new. Didn't bother making every cable as they aren't visible, like they have been in my other (insanely large) builds. I found that if I can remove the radiator from the case, I don't need a double or triple tower case. And the good thing with an external radiator is that I can put it in the storage room, right next to the "office" and forget about everything called noise (the cabinet shouldn't get warm when the radiator is outside it).