My changes: I put poster board into his main body so that he would be more rigid. I made the wheels larger and put them under his body. I added black embroidery to his hands. I made a base for the eyes using polymer clay then crocheted a outer layer of yarn. His neck is make of wire covered with yarn so that I could change the position of his eyes.
Here is a work in progress of him...you can see a bit of foam board sticking out of his base.