
you could use themalite blocks ontop of the metal and then the firebricks ? and the top could be almost any insulation but a couple of inches of vermicrete would help loads, infact you could probably go to town here as its vertical and the space constraints are often not so important vertically

but the original poster wanted to cook 2 pizzas and only hold heat for an hour so I would say this would suit his needs? at the end of the day this is a tool, so if it works for what you want then its good?
I know when I build one I wont be entering it into any beauty padgents like some of the works of art on here, I wish I was that skilled, but I think I will have to make for with function over form

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