I don't see in his post where he states a 2 way center. For simplicity sake, I think I would just go as good and big of a coaxial as I could anyways.
It would work perfectly for me.
2-way front L/R
1 way rear L/R
1 way sub
Homemade passive crossovers for center and rears (which will have mid & tweet right next to each other) and that's a wrap.
I wonder if 2 MS-8's could be strapped together for those with more complicated setups...