Help with port. Box is designed

[banginhummer]

Ok I designed the box, but need help with the port, which will have only 1 common wall.

here's some specs on it.

can anyone design the port and calculate the length for me

also, this is a two part box, another box at bottom, will all be connected and siliconed together

would like it to be tuned from 32-35hz subs are 4-15 massive hippo

here's what i have

some specs bottom box, still working on top piece.

Lincoln Towncar bottom

E n c l o s u r e S p e c i f i c a t i o n s :

F b = 3 5 H z
V b = 8 . 6 f t ^ 3
Bottom Piece

E x t e r n a l H e i g h t = 7.75 and 9.75 i n
E x t e r n a l W i d t h = 40 i n
E x t e r n a l D e p t h = 27 i n


C u t S h e e t L i s t :

* A l l D i m e n s i o n s i n I n c h e s .
* W o o d T h i c k n e s s i s 3 / 4 f o r a l l P a r t s .

E x t e r n a l E n c l o s u r e P a r t s :

2 x T o p & B o t t o m (x2) ( 3 p a r t s ) = 4 0 x 2 7

L e f t & R i g h t S i d e s = 25 1/2 x 7 rising to 9 (4 1/2 angle)

F r o n t 40 x 7

B a c k = 40 x 9

yes bottom has wedge, trunk dips a bit

would like the port on top

like this