Just finishing modding the Akitio Thunder 3 case.
Thanks to @benjaminlsr for sharing his project, and helping with mine.
The temperatures doesn't go beyond 68 degrees. Running benchmarks on ultra and retina display resolution.
Made circular cut with a hole saw from ebay, (cheapest one from china 110mm), and regular driller. Also some WD-40 to lubricate. Was easer them I expected. After that, I sanded the border to make it smooth. Then, drilled the holes for the screws from the fan grill (120mm).
I didn't exchange the fan, just turned it around to flow out of the hot air. I wish I could change to a better, less noisy one, but with the EVGA card you don't have any space left (original fan is 20mm). The Zotac version seems like you can fit a 25mm fan.
For the cable, because didn't want to deal with welding, I used a low profile 6-pin I found on ebay so I could close the case. Also made small cut in the back to pass cable through so I could close the back of enclosure as well.
Really liked the end result. I'm sharing some pics.
Links of what I used:
Hole saw: http://www.ebay.com/itm/391626405442?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Fan grill: http://www.ebay.com/itm/351212949553?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Low 6-pin: http://www.ebay.com/itm/261567563062?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT