Above is the link that started the discussion and below I have posted a scan of the book page. If you want a printable pdf, let me know and I'll email you one. This project looks trickier then I remember it and, if I wanted to make one now, I'm not totally sure I could figure it out easily without the article. Good luck if you're making one. Comment below please and click to enlarge the pictures.
It took me almost as long to find one of the boxes
as it did to find the article ...