Hi Brownee,
Welcome to the forum!! You'll find lots of like minded people here....
Yes, you can certainly use AKSonics for the rear channels, although the power handling might be a bit more than you need.
The AKSenter is done, I have one in my system right now, I have the plans, but I'm frantically trying to find time to do the instructions..... It's the old question, too much to do, not enough time. I'll keep you posted, as I'm trying to do with the US Audition amp, the DAKSA with Ben, and the Nirvana Plus for the 100W amp.
Thank you for dropping by!
Cheers,
Hugh