Yeah, I think the sides are going to be too low of an angle to get anything out of it. I personally think, with a stiff dough you could free form a deep dish pizza but have yet to try it. It would mean a weird looking and thicker edged pie though, and I would try it in a quiche/pie dish because if it did collapse one way or the other it wouldn't be much of a problem and would still be contained and edible, glass can give a nice finish to regular pastry but I've not tried 'bread/pizza doughs'