I am prepping for the arrival of my primavera 60. I can't wait. I am thinking of putting the oven ( on it's included stand) on a concrete pad. I have neve done any concrete work before and wanted to get some pointers. First it seems the stand for the 60 is 42 x 42 So I am thinking of a 48 x48 inch pad. How far down do I need to dig for the rock and pad? How thick should I make the pad? Do I need to reinforce the Pad with debar or is metal mesh ok? The primavera 60 weighs about 400lbs. Any additional pointers would be great. Thanks again.