Actually, my first attempt making an automated lift truck did indeed use a bit of string:
But I wanted to have a multi-stage mast mechanism, and one that didn't use any string. I didn't have enough ratchet pieces so that was why I took the idea of the scissor lift. It went through many stages - starting off extremely complex (and extremely unreliable). In the end, I quite liked this lifting principle, even though it is a bit, er, unconventional... and, it's not actually a multi-stage mast.
But I thought it was fun, and my little video was supposed to be tongue-in-cheek.
Thanks for the feedback! :)