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I have a thinner dome than that and it works fine. As for the floor, the standard firebrick is 2 1/4 or 2 1/2, so the standard floor is thinner than that.
Remember, full bricks don't conform to the dome shape very well, so you still will have to do quite a bit of cutting. Hi alumina firebricks don't cut very easily, at least compared to fireplace grade firebricks.
The bricks I have were cast with a taper. Also I'm thinking of using a domical arch so I won't need to do very much cutting. You can see my 3D plans on the introductions page. This is my first attempt designing the oven and if you have time to give some critiques I'd be very appreciative. (I've made one change - I've made the door 4 inches wider.)