Power-suits are not easy to make. Make the torso too big and it'll fall over. Make the legs too bulky and it'll look like it's wearing balloon pants. Adding rotatable joints can make it unstable and shaky. And weapons can throw the whole model off balance.
As I said, they're not easy to make. But Cam has made it perfectly.
I love how the shoulders are big while the arms are so shrimpy. But yet the model stays upright. And it has tiny feet!