Very nice, Lenny, I was just thinking to myself earlier today how, if space were not a concern, how a side by side arrangement of burner and stone is preferable to burner under stone.
I like the deflection. You might want to move your deflector up a tiny bit higher so that it blocks more of the edge of the hearth. If you're not careful, that edge can get super hot. In commercial ovens, the deflection comes up to about 4 inches above the hearth. so the heat has to come up, around and down to hit the hearth.