Yeah there's plenty of space back there. I was able to shove everything back there and strap it down fairly well. Cable management took maybe 45 mins to do, so not too bad. I love the case itself. Fan controller is awesome to have, very sturdy material and looks nice. Case fans it came with are good too. The giant gaping con it has though is that the side window got scratched to death when I cleaned it with Windex and a cotton towel. So if you get it be sure NOT to do that. I think I even scratched it with my fingernail when trying to rub something off of it. So that's annoying. Also the rubber grommets like to come out of place if you man handle them too much, but they go right back in.
But otherwise it's awesome.
This is how much cabling is crammed behind the tray.