yes guys, as the title says's how in your opinion would you brace this box?

here's a link since i can't post pics here: http://forum.ecoustics.com/bbs/messages/4/487885.html

Lots of bracing perpendicular from large, unsupported walls - "swiss cheese" style.

Now, if you're concerned about SPL numbers and not about making it as acoustically dead as possible, that's different...

This may be somewhat of a thread-jack, but how do you take into account the change in port area (if i'm looking at the pictures right, it looks like it gets wider to more slim) when figuring tuning?