fiberglass box, port it?

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ok. so i got a fiberglass pod. lets say i wanted to port it.

now, ive read all this crap about porting rectangles, or squares, or even triangles.

how on earth do you port a oddly shaped blob of an enclosure? i can imagine you would use the round port-hole tubes and cut it to length... but how do you calculate the length\diamater of it? my enclosure is about .5~.6 cuft (i cant perfectly tell with the subwoofer in there)

i think im gonna see how this sealed box turns out for the RE SE (they recommeded a .5 cube sealed for SQL) so i fitted it to those specs... im just waiting for the amp-

how would i port a fiberglass if i wanted to?

or;

how would i calculate the port for length\diamater with a round port?

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