Someone over at Reddit has one in his Core v1. It JUST clears the window.
Bran_Flakes is correct. 6700k is better. Is it $100 better ? That's the question only you can answer. IMO though, 6600k is capable of 99% of streaming and gaming. 6700k is only for those that need hyperthreading for that slight bump in rendering and encoding.
The Hunter duet seems like a cool solution, but the problem is that this case only fits 140mm radiator, wish I have gotten the Phanteks Evolv ITX like you. I looked at the EK predator and Swifttech 140mm AIO, can't seem to justify the price and they aren't readily available from where I am located. Plus a bigger radiator will block more of the main entrance for fresh air, so the hot air inside the case cannot escape, hence the thought of adding two 80mm fans in the back.