So, I found a video on how to make these. Unfortunately, I think the book you use as the base has to be somewhat thick which is a bummer as I had already decided on 4 to use and 3 are fairly thin (less than an inch.)
Has anyone tried doing these? Any tips/advice? Anyone had a bad experience with the invisible shelves? We're doing them with an L-bracket and wood screws, not with one of the kits, so the book on the bottom will be permanently stuck to the wall, so kind of destroyed/not accessible. But a heck of a lot cheaper than buying the fancy shelves, which I am not convinced don't hurt the books at all.