A DDC mounted to the spine should fit no problem. I believe the Ion should fit as well based on the quoted dimensions from XSPC and the 51.8mm of space in the GPU bay in the Ghost?
I've asked Zotac for dims for the terminal but nothing yet. Looking at the Sweclocker build (specifically @ 25:30), visually it looks like there might be space for the terminal. You could then use the two front G1/4 ports rather than the two top ports Zotac photos have the barbs screwed into. Tight 90 fittings to fit between the card and side panel becomes the next issue.
Hi i have seen video from Sweclocker , he use EVGA GeForce GTX 1080 SC GAMING
https://www.evga.com/products/product.aspx?pn=08G-P4-6183-KR , and the dimensions for this graphic card is Length: 266.7mm and Height: 111.15mm . As i mention before the Zotac dimension is 212mm x 164mm x 41mm so is much more tall graphic card . Evga 111.15mm <-> Zotac 164mm . I think there no space to fit this Zotac to this case. Maybe i'm wrong maybe not.