Good stuff. I like how you flipped the cards over to mount them above... very DIY.
What hash rate are you getting on ETH? The calculator says is should be around 200MH/s. I'm mainly asking because it will effect the ROI.
Also, for people using Nvidia cards, I would go with the 1070s, they are cheaper , do better on ETH, & consume less power. I have 1 rig with 5 of them and another with 4 1070s and a 1080.