Looks really nice, I think you could potentially make some things better for yourself with cabling by turning that 3.5" drive round and running the cables up the back of it instead.
That's what I've done previously when the drives are on show like that and it should mean you'll be able to lose that SATA power up the front and SATA data too.
What I tend to do also with any visible cables over the front of the board is run them around the components where possible to clean it up a bit, I can see that cable over the top of the RAM looks like you could tuck it around the edges of the RAM slots to tidy it up?
Great nice build though, I always had a thing for this case and never tried one.