Very elegant, modern looking setup, right out of the pages of Architectural Digest. I'm wondering how it sounds in that configuration, as Conventional Wisdom(tm) says Maggies have to be out a few feet from the wall.
As for using an integrated as a preamp, my brother uses a Denon receiver as a tuner/pre into his Mc power amp; his old tuner/pre had developed a bad hiss problem he couldn't fix. The setup works very well for him.