Actually judging from the pic in the link below it appears that there may be enough space on the top or bottom of the motherboard tray (where the cut outs are made to thread the extender) to install perhaps at least 80mmx10mm fans, although this would in part depend on how flexible the extender cable is (well the case is 3cm higher than an itx motherboard). Just saying, not that I will probably try this, but it may help out people with heat problems such as with m.2 drives on the rear side of a motherboard.all the major heat source components intake air directly from outside the case, psu exhaust directly out top, open style gpu directly exhaust out top, bottom and back, cpu exhaust indirectly out top through convection, since all fans are intake it creates positive in case pressure hindering dust build up, this is much more efficient then conventional case designs
http://pics.computerbase.de/5/9/7/5/9/17-1080.1149845798.jpg
Also bringing up cooling I noticed someone mentioned that they got better temps with the C7 with the fans mounted vertically as opposed to horizontally, so I wonder if Dan's results would have been even more impressive if he had mounted it vertically. This may have helped to push the hot air out of the top of the case instead of being cramped pushing againat the ram which was really closely located to the fins in the pics on page 87 of this thread.