I stood up R2. He's stable for now, but later I'll add whatever I decide to keep him that way.
Here's another with my 5 year old daughter next to him, just to get a real idea on R2's height.
I've decided to use the bottom portion of a Weber Grill for his head. It measures 22.5 inches and will be perfect. The grill will be about $60.00. The only problem is that after I remove the grills legs and the ash catcher I'll need to do some bondo work to cover the holes left.