I'm out of the country right now, but if I remember that radio with face plate is about 6 Lbs with out the heavy speakers. The void could be used for a monster autometer lightweight tach or what ever. That is rather light for a B-boy.
As the title to this thread implies, I will reveal the real weight real soon as well with a thorough explanation. Good luck ThumperD with the reveal. I do hope for sub 3000 as well, then you can really go for kite flying school. LOL.