My son is 5 and he love Optimus prime. He 5th birthday was Optimus prime. He’s execited to able to transform like his favorite character for Halloween. So I started Brain storm and searching the internet on how to make Optimus Prime. It took about a week and half to make this costume. Then I had to redo top part because it was to heavy. It is all made out of cardboard, handed painted, and hot glued together! The grill is popsicle sticks. The pipes and the guns on his hands are paper towel and toilet paper rolls spray painted.