Very nice drawing, Andy. Unfortunately, the dimensions are a little hard to see, and I can't make out the box width one in particular.Did you try enlarging the cabinet? Like I said before, the first design you posted gave some funny results, but that's just a computer program... Maybe it will still sound good, and that's what matters.
The only thing is, I'd change the woofers to a clamshell (cone-to-cone) configuration, its the best for an isobarik loading.
JMO.
Looks good dude.
Adam