This is what I've done so far. Going to replace the 980ti with a Titan XP maybe 2 of them in the near future among a few other little things. Then when Skylake X is available I"ll add another system to the other side of the case. I wonder if Thermaltake will ever make the side window available for purchase??
https://youtube.com/watch?v=9sjcKkoZZKY
https://youtube.com/watch?v=4heRaavAhgI