I contacted Alienware and they told me they do not have any information or support for pre-Dell Alienware machines.
Any help or instructions on how to properly secure the side panels would be appreciated.
(note: in the image it looks like the right side panel is securely closed. however, it is NOT properly secured in the rear where the lever is to latch it shut. I don't understand how to get it in the groove on the case rail and to make it secure right).