[Venksta]

This is a great idea. What are you planning for the robot mode? Original character, or making it into an existing one? As for the fists, they seem to have the effect, as if the Hulk punched the door from the inside, leaving an impression, rather than an actual fist sticky out. So I would suggest you to get some type of sculpting putting(whatever you can find at the hobby shop), and sculpt it on, instead of using real toy hands. Since the impression isn't a detailed hand, you just need to give it the basic shape and not worry about fine details.