LEGO Turing Machine

I'm always deeply disappointed (less deeply as time goes by, I'm coming to expect it) when something like this in Lego is actually just a peripheral for a program running in silicon somewhere.

I no longer have any of my Lego, but I remember building most of a completely mechanical Turing Machine way back in the early 1970s. So satisfying seeing it work purely mechanically, and I'm sure someone with more creativity and skill than I had, or indeed have, could do it.

Please?