heres a good way to do it. If the port uses 1 wall then you change your LxH to L+1.5xH+.75 (if the L is parallel to the wall being used, if H is parallel then add 1.5 to H) If it uses two walls of the box then L+.75xH+.75 to give you total volume taken up by the port. If three walls then only add .75 to the L or H depending on which applies.
But yes. You include the material (wall thickness) of the port.
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4 15s + Flat Wall + 10k = Loud