Torres tuning cal help for non l shape ports "s" shaped

[fatboyracing]

Hopefully someone can help or explain this to me. I need to build a box and the depth can not be real big I will not have the room to put the sub and the port if I do it as a L shaped port.

How do I plain a s shaped port I thought it would be 6 common port walls but that is not it errors out.

Do I still just do the 3 common port walls and just increase the port length and not worry if it is l shaped port or s shaped

I hope what i am asking makes sense