Man, I don't even want to think about this "mod." I've lost 5 hard drives in the past month but if you feel like going nutty with your 80GB, go for it.
Grynx, which is the sound your computer will make when you install this plexiglassed HD, shows us how to lift off the top plate of a standard drive and replace it with a slide of plexiglass. Foolhardy? Sure. Dumb? Absolutely. Possible? I guess so.
Plexiglas hard drive window [Grynx]