Cool, doesn't even look like a PC hardly, with lots of the motherboard being covered along with open form factor and vertical GPU - it's kinda like a dense solid black metal mass of a machine! It's good that it runs silent & performs at max (watercooling), that's an often undervalued/uncommon combination - so this build is unique in a lot of ways! Congrats! (I guess I would have chosen an i7-6700K rather than the 6600K though if spending all that money & effort, but it's still a beast of course!)

Where's the power button?

simple looking but pretty

That looks just other worldly. Massive congratz! I've thought of something similar with fittings and possibly surrounding the case with pure acrylic just to protect it. But just wow!