I'm looking at paperbook storage, too
since I happen to have quite a few, especially mysteries, and like to re-read them occasionally. And, I have way too much stuff in my apartment (although my throw away plan has started, so it's getting a bit better -- I'm helping out our local recycling place).
And, of course, the paperbooks don't fit well on any normal bookshelf. I'm thinking more along the lines of a lazy-susan type arrangement. Or possibly something with drawers, if the drawers were the right height so I can stack the books spine up.
I may look at building something in wood or plastic -- after all, I've got a CAD system I'm learning (Pro/Desktop, excellent deal for free -- 3-D design, assemblies, simple kinematics supposedly, and more) so it might be a good learning project. And, I have a friend who has access to a CNC router.... so I may end up with custom plastic storage units.
BTW, part of my sort term solution was to ship a lot of them off to friends and relatives. I'll get them back eventually -- and by then I'll be ready to re-read them and maybe I'll have a good place to store them.
Tony
Tony