Hi Fronglo
I don't know about the full sized bookcases, but let me tell you what I did to get extra book shelving space in my Inn Room...
I was gonna just trash the red/white table that was given to me upon arrival bc I really didn't have room or purpose for it in my room after buying a few other tables for my room, then I brainstormed an idea to use it as a place to hold a couple of decorative vases and books. I turned it short side facing me, and backed it up into the wall until a good portion of it disappears into the wall, taking up less space and essentially creating a cool desklike table. I now use it to place my most 'important' books on, along with a couple of decorative vases. Looks nice. I know this isn't what you were asking, but I just thought I'd throw that idea at you as a space saving way to utilize something you already have to separate special books from the rest. I also placed a simple stool at the 'desk' for effect.
Good luck finding what you're looking for!