Port area seems a little small for one thing, but I am newer to a lot of this. At the recommended 15 sq in per cu ft of box volume would put you at needing 21 sq in of total port area. A 3" aero only has an area of around 7.065 sq in. Even if each were in its own chamber and had a dedicated port and had 0.7 cu ft of volume after displacement, they would still need 10.5 sq in of port area minimum for each sub and port.