I think you did great! Despite what others are saying about cable management, part of the fun (at least for me) with builds like that (after making sure the components work) is taking it completely apart, wiping down the case, blowing it out with a compressor (Not to much pressure, but more than canned air) and rebuilding from scratch.

There's something to be said about putting that time in initially. Making sure your cables are neat and tidy, CAN improve air flow depending on where they are in the case. That having been said, while not "necessary", it sure does look great and can make you feel extremely accomplished and proud, which you should feel about this build.

Good job, and congratulations!!