Came up shy on the net volume inside the box, so I've had to make revisions. The side-to-side braces in the middle (just behind the driver) were retarded anyway, so I got rid of them.
By the way, I ditched the VB script in favor of an Excel spreadsheet to calcuate the volume using surface area measures taken from the Google Sketchup drawing. All the files I'm using are on my web server if anyone wants to check them out, including the Sketchup drawing.
http://s16v.com/subwoofer
Bradley