It still needs the finishing work to look, well, finished, and a coat of white paint to make it all look deliberate, but we're close to being done! The new wall is a tad over twice as thick as it used to be, and doesn't feel intrusive at all. Our concern with a standard bookcase on that wall was that it would jut out into the hallway too much.
Yay Dan! He's done a great job, and I am very impressed.