Cozy Corner Wide Bookcase Unit

You'll build two of these. Attach the shelf and the 2x4 base support to the sides using glue and 2" wood screws, predrilled and countersunk.

Attach the two shelf units together using 1-1/4" wood screws, predrilled and countersunk — at least two screws at the top, two above the shelf, two below the shelf, and two at the base.

Attach the top trim with 1-1/4" finish nails and glue. Attach the three vertical trim pieces the same way. Attach the shelf-front and base-front trim using the wider 1x4 stock — it closes the gap between the shelf edge and a mattress better than a narrower board would.

Attach the plywood backing to the upper portion of the shelf unit with 1-1/4" finish nails — the lower portion doesn't need backing since it won't be visible once installed, which also saves material for another project.

Attach the shared top across both units, sand every surface, and finish as desired.