I have the bookcase built for the murphy bed. They went together fairly quickly. I made a jig that acts as a square for the shelves. It also keeps the shelves from moving when the pocket screws at put in. Here is a picture of the jig. I have it notched out for an overhang I usually put on the top.
I usually attach all shelves on one side and then flip it over and repeat. With the jig it also keeps glue from getting everywhere when I flip it.
Here is the assemble footage
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