You would have to design a xover for those 6x9s to sound good. My center's huge, but my 70" tv sits on top of it no problem. Do you have a pic/measurements of the space you're trying to put the center?
That second pic looks cool. I just don't know if I want to build something with so many drivers. Is there an advantage besides power handling/output of using so many? I have thought of something like that pic as well.
I am going to take some measurement's and some pics shortly.