Plans Subwoofer HELP MAKING PLANS FOR SUBWOOFER?!?!?

HELP MAKING PLANS FOR SUBWOOFER?!?!? - plans subwoofer

I've tried to make some plans for this subwoofer. http://www.crutchfield.com/S-7fVTuU6vFYn/p_098CO104S2/Orion-CO104S.html. I can not imagine what if. I have a box worn. Someone gave me some plans or a website to find the box. I do not understand the size of the port. Must be at least 18 cm high, the diversity 21ATTENDU, the depth of 4 inches and two 12 cm deep. Wood thickness of .75 cm estimated.