Actually I think Iron Man needs to be made over Snake, for the following reasons.
1. Snake's body, with some vertexing, it the perfect shape for Iron Man when compared to Samus (despite the awesome textures and vertexes). Plus, the head would look better for Iron Man cause of it's human shape.
The main things you'd need to do are:
1. Flatten out places that don't need any major curves, and make places of his body more polygonal where they need to be.
2. It will just look better in the long run. Plus, Snake could be made into the Iron Man seen in the MvC series appearance-wise, or you could go for the 90's cartoon Iron Man appearance. Like the one in this vid.