Great looking tank! I like the idea of glass tops inlaid in the acrylic. My tank is 6'x3' with 2 openings in the top, about the same size openings as yours. However, I did notice that soon after setting up the tank the whole top piece of acrylic bowed up a little. Is there any wiggle room around the perimeter of the glass pieces? If your top acrylic piece bows some, that may create an issue with the glass. I asked my tank manufacturer about the bowing and he didn't know why it happened. No issues with it so far.
How many rays are going in your new tank?