Under-Loft-Bed Desk System with Storage

Build both bookshelf boxes using 2" screws and glue. Build the first one complete, with its top shelf. Build the second one the same way but leave the top off for now — this is the one that becomes a desk.

Attach a footer to each bookshelf with 2" screws and glue, inset 1/2" and with the top edge flush — the bottom edge should sit just shy of touching the ground.

Attach the plywood backs to both bookshelves, making sure to fasten into the shelves as well as the sides. For the second bookshelf, do this after its top/desktop is on if that's easier to reach. Use glue and 1-1/4" nails.

Attach the small desktop to the top of the first bookshelf as its finished top shelf.

Attach the large desktop across the top of the second bookshelf and the two separate desktop legs, using 2" screws and glue. Sand, fill any holes, and finish both pieces.