I fit a gtx 1080 in mine with zero mods to the case. You should look in the builds logs section as everyone has a different route. If you get the front bezel you can fit any card really as long as it is a small form factor.
Sorry, should've been more clear. The 1080 and 1070 are both "oversized", how did you manage to fit the power connector from the HDPLEX at the back of the case? I looked at builds but all I see is people drilling in either the power connector or sawing the case for mounting the connector somewhere different than default location.. :/