My rig is going to have 6 gpus in the front, because there are two 3-slot-cards. For usual 2 slot cards, i think the Rosewill case easily takes 7 in the front.

But i won't need space / holes for fans anymore. Because i will try to get the included fans in their black boxes on the inner bracket and move it to the front, as in the video. When i'm done with it, i will measure the free space again.