Cool thing, BTW... Everything on the 727 works. The spoilers and flaps function during the 7 minute presentation, as do the gear, speed brakes, thrust reversers, and rudder. :)
It's also supported by beams from the floor. The interior is open and you can walk inside of the thing. Remember too, the thing has been gutted, the engines removed, and one wing is missing. I'm sure they trimmed weight anywhere they could. ;)