Looks like a nice build, just remember that cable management in a case like this, is everything for a clean look.
Since you seem to have access to cutting tools, so would I have made a small hole on the side of the motherboard tray, so you dont have to run the cabels to the cable holes.
The CPU power cable in black, is a good example of a cable that would have benefitted from a small hole next to it, so it dont have to run all the way around the motherboard.