I remember back in my college days one night I was with the clean up crew after a dance in the cafeteria and I got roped into moving some sort of Yamaha Mini Grand Piano cause the band was too cheap to hire roadies The F*cking thing weighed at least 250-300 lbs and I and another guy almost broke our backs hauling it out to the band's truck. I think it also had some sort of harp and string arrangement inside and it was black and looked like a miniature grand piano. I think it was some sort of clavinova or something.
Even nowadays, my Kurzweil in its hard TSA case weighs in well over 80 lbs. I wouldn't even dream of gigging with it. The only reason I even have the case is in case I ever have to move to a new address. Furniture movers have about the same gentle ham fisted touch as your average roadie.
The Piano in a box that I linked above must weight in at 400 to 500 lbs. You'd need a forklift to move that thing.
Gary