Lovely looking build, and I love the theme - can't wait to see more.
I noticed you're cooling the GPUs in parallel, is that effective? Isn't there a danger of short circuiting and impeding the cooling of the top two GPUs? Not a criticism, I'm just curious.
Before you judge a man, walk a mile in his shoes; after that, who cares?! He's a mile away and you've got his shoes!