Optimus Prime got a slightly different look in Transformers 4, and Pablo Bairan built a costume to match it. The robot cosplay is completely mobile and plays sounds. Pablo said he built the armor from “foam assisted rubber,” and you can see what it looks like without the paint and finishing touches in the work in progress photo of Optimus Prime’s feet below. Everything you see there was made from scratch except for the blue slippers.
Watch a sound and movement test at Pablo’s Facebook page.