I sourced a 4u server case with the same dimensions from Craigslist for dirt cheap and with some time and DIY I was able to get a total of 9 GTX 1060 cards in the case running stable at 22.8 MH/s @ 85w and staying at 70C each with the kid sealed..
I can get 8 of the 9 cards to run at 65C but card number 5 won't go below 68C, I'm pretty sure it's due to the spacing of my fans as it is the card with the fan against the side of the case.


Here is a video.

https://youtu.be/S_A3X-OsCkw