I have taken an old home theater receiver that did not work and I am trying to use it as a case for my HTPC. I am trying to put a full size ATX motherboard (Asus A7N8X-DELUX), 1 hard drive, 350W power supply, and 2 DVD units into this case.(16”W X 5”H X 12.5”D) Things are getting pretty tight in there. My question is: Will it hurt anything if I mount the hard drive on its side? I think I can make it all fit if I do this.