3 display port cables run into the back of the gpus, the angle of the picture probably makes it seem a lot shorter (gap) than it is. Now if you meant how do the cables run out of the 'case'? Behind the PSU in the first picture, I have outlined a section to be cut out in order to run any cables outside -- also giving ventilation for the PSU to push out any heat it generates.
Everything else (usb, sound etc) is extended and runs to a faceplate on the front of the 'case' -- along with power, reset, temperature/fan controller display etc.
In a few months (waaaaaaaaay after Christmas) and I do the real thing, I can post better pictures and even the CAD drawings if you wanted.
*edit*
it's actually quite pretty with all the LED lights and the UV dye xD
*second edit*
The temperature of everything running, is awesome. I had the three GPUS being stress tested via furmark for 50 minutes and they didn't go above 39c lol
The CPU is a beast.. I'm playing 15 accounts (again) and the damn thing stays in low power mode (1200/2000mhz) -- I am still getting 60 fps (isboxer limit) on the main window in Ashran...
Ahh crap. You guys were right, 6GB isn't enough to run them all.
It's fine if they are all on Low settings, but if I bump the main one up, the other screens stutter like crazy haha.