You need to check again.the DNR instructions don't have the "cuts" on the inside face of the box like he shows in the video, but that seems logical to me - along with the oval hole rather than a large round hole??? also isn't it weird that the front is 12 inches wide and the back is 10 inches wide (or do I need to increase my prescription) i didn't print it out, I am looking at it on the screen, but couldn't zoom in...