Some of the metal sculptures in the Mr. Iron Robot theme park are over ten feet tall — and so what if they aren't official Transformers?! These robots made out of scrapped cars and machine tools would definitely do in a pinch.
What's 19-foot tall, looks like it'll terrorize your neighborhood and completely Shia LaBeouf-free? This Optimus Prime Transformer made recycled car and truck parts. The smaller 8-foot tall Bumblebee isn't too shabby, either.