You know how big your panel is going to be in order to mount it up there? lol
Minimum, I'm betting, of 5mb image.
Edit: Hmmm... On second thought, you can make your panel the size of your display rez, then just mount your back panel image in the small area it resides in at the bottom of your screen...you're going to have big numbers for all your element placements, but it might work. At least, I don't believe your base panel background image has to be the same size as your panel element... It could, in the long run, make all your element placements easier, working off your main panel element starting at 0,0 and using your display dimensions for the placement of everything...