60-minute bookcase

Step 4 Assembly: layer 2

Now, place two lines of wood glue atop the vertical boards from step 1, and glue another horizontal board on top to make a box. Fire some brads in from the top to pin the board in place while the glue dries.

Once the board is in place, glue two new vertical boards atop the horizontal one. In the previous step, the two vertical boards were placed along the left edge and the back-right edge. This time, place the boards along the right edge and the back-left edge. This should give you clearance to place the nailgun beneath the newly glue boards, and to fire brads up through the horizontal board into the vertical boards, pinning those boards in place.