Good job on the build.
I'm one who doesn't give a hoot about being neat with cable routing. A long time ago, I tried using tie wraps and such to make things neater but found it was a PITA because I am constantly messing around inside my computer and removing/redoing the tie wraps was too much work. Unless you are overclocking and having cooling problems, I wouldn't worry about the cabling. Even if you are having problems, the best cabling job in the world will only make a very small difference. If you ever get to the point where you install multiple gpus and are OCing, that's when neat cabling might make a real difference.
I suspect I've been building computers longer than most on this board (built my first in 1986) and most of the builds over the years have used bone stock cooling and I only encountered overheating on one build. I installed a larger aftermarket cpu heatsink/fan and that fixed that issue.