This is the famous "paperclip computer." I owned this book around 1972 or so. It DOES have all the classic computer subsystems, (storage, memory, ALU, etc.)albeit in a very primitive form.

I wouldn't recommend anyone actually try to build this, these days it would be much simpler and cheaper to experiment with digital logic and computer circuitry with modern electronic components.

That being said, it's a good way to demonstrate how data moves around in a computer. It's also interesting to see what could be achieved with paperclip switches, flashlight bulbs, and a lot of wire.