Building new box, am I doing this right?

[RageQuitForLife]

I'm about to buy 2 Crescendo Forte 18's and I've starting trying to design my box and I want to make sure I'm using the box calculator right or if i'm messing everything up.

I'm using the Torres Box Calculator and Sketchup to draw the box

PICTURES: http://imgur.com/a/RtBLb <--- for some reason pictures werent working so I just linked them

The subs will be facing up in the box

one problem is the # common port walls, would I have 2 common port walls because the top and bottom are part of the port? or no?

So if anyone could help me by making sure I'm using this program right that would be great, thanks

[audiofanaticz]

yes. 2 common port walls

[RageQuitForLife]

yes. 2 common port walls

okay, so does everything else look fine with the numbers i got from Torres and my box design? will it need any more bracing?