Nice! We had something like this hanging in our house when I was a kid. I think we probably only ever got about a third of the way through, over the course of 10 years!
When you finish that, time for an upgrade?
I honestly dont know if they make them anymore. It was manufactured by a company called PAPP.
You know what that means... Someone has to make a gigantic crossword puzzle. (Me? But I don't know how to make it so big.)