The MTM's will be about 20”h x 8”w x 12”d (using all 3/4") or 11" deep (1/2" is used for the box baffle 3/4")
While the TM's will be 13" x 8" x 11" (all 3/4") or 10" deep (1/2" box, 3/4" baffle).
The Fusion-6's are ported, my box in the photo has a slot port but none of the plastic slot ports Erich found would have worked well so the height was shrunk a little and depth increased with a round port out the back. They can be used without a port, however you loose quite a bit of output between 60-100 Hz.
The Karma-6's are sealed, same size enclosure.
I am considering designing a shallow mount enclosure for both of them and or angled surround enclosure for the Fusion-6 TM (like the MTG-06-OWS)