This reminds me of the once famous "Beer Can Chicken" recipe, where a whole chicken is cooked atop a half full beer can. The concept thrilled beer enthusiasts and the chicken did stay as moist as the recipe claimed it would, so popularity soared, but the last thing I heard about it before I stopped hearing about it was that the heat from roasting the chicken would vaporize some of the leaded paint on the outside of the can (and possible other delicious paint components as well), contaminating the chicken resting on the outside of the can with a chemical residue to taste odd, but still not a good thing to eat. I wonder if the coating all cans have on their inside (usually plastic) and the paint many cans have on their outside isn't being baked into this pizza crust. I'm sure this instructable can be done with bent sheet metal or with some other custom cone holder, but I suggest it might be a good idea to look into the safety of what's being baked off the recyclables and lets us know if there are any risks.