Not trying to be a jerk, but I don't know how else to phrase this...
How do you know the canopy is opened or closed? Other than a slight frame here and there, the aircraft's canopy is completely clear, so it woudln't exactly make a big difference in visibility.
Don't get me wrong, I think it would be neat, but I'd rather see slight reflections and abnormalities on the canopy first to make it more obvious when it's opened or closed. =)