ok so basicly i dont need to be 2.75 width port all the way through the port lenght? sorry if i sound confusing :/
so lets say im make a box 20 tall 12 width 10 deep and my port is going to be 2.75 width and my height is gonna be 10 inches can i go back with the port if its called for 12 inches in lenght with out going through the whole port lenght of 2.75?