Lack-Inspired Bookcase

Build the outer box by attaching the top and bottom shelves sandwiched between the two sides with 2-1/2" screws. Check for square. Skip the pocket-hole jig here — face-screwing through the sides into the shelf ends is simpler and plenty strong.

On the sides, measure up 18" for the center of the first shelf, 36" for the middle, and 54" for the third. Predrill your holes at those marks — the thick stock splits without it — and screw the shelves in.

Attach two L-brackets on the bottom wall-side of the shelves and screw the case to a wall stud — a tall narrow bookcase tips, so this is required, not optional. Sand and finish.