It seems like he is going to go with your design there John, but its still fantasy until he gives me the real go ahead... I think we are going to go downward facing with the drivers, and face the ports at the lp.
I think he would benefit from room gain much more should we face the ports at the wall, but his concern is shaking the wall apart.. lol..
good luck with your project. not sure how the front firing ports would work in this application. post a build thread if you guys decide to proceed. i still think that just two drives and a good amp will slaughter his bose sub, but if he goes for four, how can that be argued with? :-)