I bought this book last year when I decided to try making my own Halloween props, despite a certain lack of artistic talent. (There is a good reason why I make Halloween stuff and not Christmas) Working off the instructions, my first effort was a four-foot-long man-eating slug. Both trick-or-treaters and the adults accompanying them were delighted with Slugly, declaring him to be . . . cute. Not quite what you want to hear about a Halloween prop. :-)
Anyhow, the paper mache technique has worked well for a dragon fly (not quite what you are thinking), and a Venus fly trap that is currently in production. I would have liked some information on making the paper mache creations more weather resistant, but was able to find out on a Halloween forum (spar varnish and exterior enamel, in case you are wondering).