Brian,
Thanks for all the pix. You didn't have to go to all that work, but it's fun to see others equipment. You have quite the collection.
So how did you like those Onkyo towers? They look a lot like the Athena's at Best Buy that I dislike so much. That seems like a pretty good size sub for a HTIB.
That screen is HUGE.
Are you putting in new drywall, or using existing? Reason I ask, is if you have a choice, use 5/8". I'm in the construction biz, and put up quite a bit of it. If you use 5/8" and screw it (as opposed to nail it) with heavy R19, you'll never have that "hollow sound" issue.
Best of luck with everything. Hope it all goes smoothly. Your new Pioneer should have no trouble with the Fluance speakers, and your new sub will do wonders in your custom recliner!