No idea about the cutout, John. Dan might have that info., but I can't imagine the drivers being shipped before late September, so you've got some time.
Plugging your specs into LspCAD (220l, Fb=25Hz) shows a 6" port (preferred)only 9.5" long, or two 4" ports 5.4" long each. In my opinion...
Dan W. gives some recommended alignments in this thread , and it was recently included in Adire's LspCAD. I've played with it some, but haven't come up with something I'm really happy with yet. I like the idea of applying the Linkwitz transform to a small box, but I keep running into...