Building a New Box...
 

So i'm building a new sub box for 2 alpine type-x's
1.25 cubic feet a sub...
I've attached a picture of what i want the box to look like....
But i cant figure out the correct specs...
This what i'd like the inside to look like.. i read up on the box a bit and it seems like a great design for the port....
I would basicaly want 2 of those boxes made into 1.... with the port in the middle between the 2 subs...

the box cant be wider then 23" and higher then 13"...
I'll be using 3/4" MDF so if that could be factored in as well that would be great
http://www.audioenhancers.com/images/DA110.jpg

i would add 3 more pcs of 45* and make 2 of the boxs fasn (box to box) at the ports
so when you make then filp one box plan so you have R and L ,fire a top on and now you have one box
i like the box
what is it set to ?

you confused the hell out of me lol.....
But i dont know what that box is set too.... I just found the pic...
Thats why im asking for help lol