Gibson: You bet your sweet... George -- unfortunately -- doesn’t like things that don’t work. I have in the past built him props that I thought were just supposed to be props, and then he goes, "Okay, plug it in now."'
George Miller simply assumed it would work; and as a result, the end result was actually a functional guitar and speaker system.
Why would you think they couldn't work? My ultimate dream car was to own a real semi-trailer with that would open up like the old Optimus Prime toy so that when unfolded it would reveal a huge sound system ready to go in a matter of minutes.