I am thinking of making a screen protector, at least in the short term, out of a sheet of transparency or something similar. I don't have my 770 yet, so I need to know... how much room is there to tuck something under the frame of the screen? (i.e., how much bigger than the screen do I need to cut a sheet of plastic to slide under the screen frame and work as a screen protector?) Could somebody with a 770 try sliding something under each of the four sides and measure?