I tried something very similar. Raised pizza stone on the Jumbo Joe. I just used the wire handle that the stone came with and flipped it upside down. Not very sturdy, but I was careful with it. I also threw a cast iron heat diffuser underneath to try and help maintain temps, but I fired several pies in a row and couldn't maintain 500°. First one came out ok, and then it was a struggle after that. I kept loosing too much heat taking the lid on and off. If you can't keep the temps over 500°, ideally 700°, you might as well use an oven. Let me know if you have any tips for maintaining high temps with a Jumbo Joe. Maybe I just need to double or triple the amount of hot coals I was using.