Marbles,
This may be a stupid suggestion (one of many), but why don't you just sell those drivers and buy a pair of decent in-wall speakers? You could get a good buck for the drivers and pick up some pretty good in-walls. I believe AV123 was coming out with some that looked cool. Also, ACI sells in-wall speakers as does partsexpress. I also believe Theil makes some high-end in-walls. Can't help you on which one sounds good because I haven't heard any.
There are lots of things to keep in mind on ...
Jackman, good advice all...
Rick Craig would make the XO to take into account the wall as the baffle.
He mentioned that it would be better for a local cabinet maker to make the cabinets as his is expensive for inwalls.
The drivers would have been coming out of a one in the world pair of marble mini 9.0 column shaped nOrh speakers. I won't sell the speakers, but wasn't using them either, so I thought I would use the drivers.
I did get a chance to do some experimenting today and tonight.
The nOrhs sounded OK, not great but not bad as matches for the VMPS speakers. They are so damn heavy I was worried that the one over the sofa would fall.
After watching HPIII - Prisoner of Askaban tonight with the family, I swapped out some B&W 601S2's. Normally quite a step down.
I calibrated them and put on Steely Dan's 2 Against Nature DVD-A.
They matched VERY VERY well with the VMPS

Must be the metal tweeter. Anyway they fit the area much better and sound better too.
Looks like I will soon be selling a pair of VMPS 626's.
An inwall speaker will be in my near future, but I now doubt they will be made with Scan Speak drivers.
Oh well, back to the drawing board.
Merry Christmas to all.