Iron Giant? I think you mean Foam Board Giant.
Building A 15-Foot Iron Giant Out Of Foam Board

This is a video of Josh and friends from Youtube channel FliteTest constructing a massive 15-foot Iron Giant out of FT Maker Foam (which they often use to make model aircraft). Man, that Iron Giant would look great in my…apartment parking space? He definitely wouldn’t fit inside, that’s for sure. I don’t think my apartment even has a room that measure 15-feet in any direction. It’s like a shoebox, if shoeboxes came with a roach problem that Nike refuses to address.