I've built two, and both were completely trivial compared to this. One took me about a week, the other took me and two other people about a month. (In both case

I've built two, and both were completely trivial compared to this. One took me about a week, the other took me and two other people about a month. (In both cases, working an hour or two each day.) I can't imagine the work that must have gone into this.