Thanks for the comments! No I didn't make a template for it... D'oh!

I just kinda winged it. I measured height and roughly width and kind of went from there. noting too precise... Who knows if it really made a difference or not. I would like to think it does offer some releif from the hot temps under there. If you do make your own, make sure you allow some extra for the tabs to mount it. That was the one area I was almost a little short in. If you get going and have some questions, let me know and I will try to help.