First of all thank you for your advice and information. The only part of the process that confused me a little bit was when you were talking about doing the walls. You suggested that the strongest method was to lay the rock on it's side. Assuming that I am using 4 x8 sheets, do you mean to lay it on the 8' side or to stand it on it's end and use the 4' side? I know this might sound silly, but I want to make sure we are talking about the same side. When I first read your note, I thought the 8' wide side, but then you mentioned it was harder to finish but pieces as opposed to factory joints and you made me wonder. Could you please explain. Thank you again for your advice. I appreciate it greatly.