[maburton]

thank you for the comments, I am not a mason, never laid a brick in my life. I am designing on the fly from material on my father-in-law's construction office. I am not going to pour a shelf for the oven, he had some cement window sills, 50" long 3 " thick and 6 inches wide with rebar already in them. He had plenty of steel so I am just going to lay the window sills on the steel angle beams for a slab. then pour vermiculite and FB board under the fire brick floor. A lot easier than pouring cement. I tried that, never again. So far all materials have been free. But I am gong to blow the bank on insulation from FB. I will show you a pic of the cement window sills when I get back to work in 2 weeks.