Hi, 

The main body plate is laser cut.  It only makes since but although I used 3mm thick acrylic plastic, the body plate could easily be cardboard.  I'm hoping to see somebody laser cutting body plates from regular 3mm thick cardboard ... maybe make two sheets but crossing the grain for added strength.  I don't know if those $100 laser cutters you find on eBay can do this.  Another interesting thing to try some day.