These DIY Optimus Prime and Bumblebee Halloween costume ideas were made creating a pattern out of paper and taping it together. Then once the measurements were worked out, the helmets and other pieces were cut out of styrofoam and attached with hot glue and duck tape. The body pieces are styrofoam wrapped in fabric.
The helmets and wheels on the the leg pieces are painted with acrylic paint. The whole process took a long time especially designing and redesigning the pieces so the kids could easily run around in them without breaking it.