Help with box dims for zvx

[EddieFromOhio]

Hey all. I am new here. I just got my first skar setup. I got the 12 inch zvx but only tickling it with a rp800 skar. Hoping to upgrade to the rp1500 today. But I love the way it sounds now. But my box isn't the best. So I need to build another. I'm new to this but can built stuff. I need help with dimensions for my 05 honda civic. I want to go for spl over sq. My current box is 3.4 cubic feet. I didn't build it. Got it from a friend for free. It has a single 4 inch wide port and the port is 11 inches long. It sounds good but I want to build a box that looks nicer. I will be using 3/4 MDF or plywood. Whichever is recommended. Thanks in advance.