What's the total internal volume of the ported section? Gah, two ports at 180 from each other like that... I think it'll be a big flop to be honest. Cancellation too... Plus, because of woofer location I bet one port will pressurize and be more effective than the other. Then again, with a 6th order enclosures I suppose one port MUST pressurize of be more effective, not in q bad sense as the entire enclosure is built around the parameters at hand. Err, also, if you sealed the cutout and moved woofer location it'll still have the same problem I'd assume. I haven't the slightest as to what the beat location would be for the driver.
I can't wait for a guru to chime in, I'm interested in this concept now.
If it checks out on paper, remember that's the dynamics of this whole hobby crunch up paper and drain threes all day long with it in the ol' wastebasket.