First time GeekFest presenter Grant Truman builds working model trebuchets. You know, the medieval siege catapaults? And at GeekFest, not only will be be talking about the making of medieval siege equipment, he'll be there to help you to build your own model trebuchet and then use it to flatten a castle!
He will be located in the palatial workshops of Coal Creek's joinery*
*I've never been in there. I just assume they're palatial. Your mileage may vary.