After modding one Lack bookshelf I don't think they'll work. After all my cuts, and re-stiffening the shelf, it still wasn't holding up and it takes a lot of time to mod each shelf. Looks like the shelf design are leaning toward standard dado cut built-ins. I'm still on the hunt for decent designs and construction details... Anybody know of other decent options that simulate a floating look but could take the weight of books?