if your meticulous you could cut holes in your mobo tray. You need to somehow get those wires to the back of the tray then, you can use clips to hold them in place
I already tried to put some of the cables behind the mobo tray, but then the back panel would not stay because there were so many cables. If I were to do that, how would I get the back panel to close with all the cables there?
its kinda tricky, to get mine on i get the tabs locked in at the bottom then push the top on, u just have to work at it and make sure non of your cords are bunched up.