The pictures inside your case give me anxiety for some weird reason. That's the cleanest* inside of a PC I've seen in my life, almost artificial looking; are you building in a clean room?
I built it in my basement. Why would a newly built PC have any dust?
I'm sad you don't think much of the cable management. I think I did pretty good considering there's 11 drives, 6 fans, and I wasn't able to use custom lengths on any of the cables.
*Clean in terms of dust, not cable management