I got a 900- my way around that was just to put smaller cables through the gaps in the spare 5.25" bays, i did all my fan cables like that so it looks pretty good now [avatar is old lol], i'm gonna take a drill to the mobo tray when I get my next mobo whilst there isn't one in up top and maybe down below so I keep my options open.
Nice build though, one other thing is if you're not using the side panel fan then take off the acrylic holder it looks MUCH better without it, but careful not to let the screws have their full travel when you re-attach the plastic rivets, otherwise they will bite through the rivet- it helps to stuff some washers to take up the slack where the acrylic used to be.