RPF member sandbagger (Barry Armstead) previously built his Iron Man suits out of pepakura and fiberglass. But his new suit is taking the build to a whole new level of awesome and realism.
His current suit which has been a work in progress for nearly two years is made out of steel. He notes that he still has a long way to completion before powder coating the suit red and gold; with the electronics, lighting, padding and animatronics to follow.
Steel and cardboard prototype.
Here is a short video that shows the suit's mobility. You can view more of his videos here.