Flutterby™! : stairs & bookcases

I could rip off this SE post wholesale, but instead I'll divvy it up into two sections. This one will address bookcases, specifically the Bookcase / stair combo pictured at the bottom of this post and repeated here. We've got 8½ foot ceilings, we're planning on built-ins, we don't want extra stuff to dust at the top, but getting to the upper shelves can be a challenge. In hindsight, the solution is obvious: Build the steps into the book cases.