Using .5 as the displacement (you're going to want a little bracing) I get 10.38 net volume, 148.75" port area, 35.48hz. I used the xplicit audio app, not Torres, as I'm not near my PC.
If possible, Make the box a couple inches deeper, open that port up another inch or two wider and add some length. If I was building this box I would do a center port that was as wide as possible. The port walls would then add a ton of strength to your baffle since the baskets would be sitting right in the end of the port walls/sides. I would single layer the sides and add window bracing between the side and port walls. Single layer sides will give you a bit more room to squeeze more port area into the design.