I'm about to install an unused, unpainted vintage 602 and have some questions: 1. I have 3 baffle plates, is that all there are inside? 2. Does anyone know how the baffle plates are arranged inside? 3. Can I use unpainted? I do like its current cast iron look. 4. Should I line the bottom with fire brick, sand, or something else? 5. Does the round warming plate just sit on top? Does it need to be "cemented" in? Thanks.