Very nice system, I really like the way you have situated everything and your base boarding idea is different.  It looks like you have power and signal right next to each other. How do you ensure no interference... in my system if I get the speaker cable very close to any of the power cords I can hear a slight interference.  How much speaker position testing did you do before you settled up on this, I have a friend with similar speakers and he had a hard time getting things to work but he had REL subs.  You have a very nice room and have really put together a great spot for great listening.  Well Done !!