I have built and installed floor cabinets with a nicely finished quartersawn oak top. Now I am ready to install bookcases on top of them. The cases will be anchored to the wall but I'd also like to secure the vertical sides of the bookcase to the oak cabinet top. The cases are painted plywood (to match existing built-ins) so, if necessary, holes can be filled and painted over. Pocket screws through the sides down into the top? Biscuits? Other? Thanks!
Kevin