Here's a crazy question...I can't find a kiln shelf for a used kiln I bought. Out of stock online and at the clay shops. Could I use a pizza stone? They look so similar...I am 100% new to this so will accept any and all mocking. I have a little Skutt kiln 614-3 I need a 10" (ish) shelf, I saw a pizza stone that size and was just wondering.