Simple 1x8 Open Shelf

Attach the two 1x8 boards together edge to edge with screws — either pocket hole screws or 2" self-tapping screws — placed about every 6–8" along the joint. This forms the L-shaped bottom/back of the shelf.

Glue and nail the two side pieces to the bottom/back assembly. These sides are the main structural piece holding everything else up, so make sure they're square and firmly fastened.

Cut the flat metal stock to length with a jigsaw fitted with a metal-cutting blade — wear safety glasses, metal cutting throws sharp filings. Predrill it with a metal drill bit and attach it across the front edge; a single 1-1/4" screw at each end is plenty. It's meant to stop things from sliding off, not to bear weight, so don't over-engineer the fastening.

Locate studs with a stud finder and screw through the back of the shelf into them. On a typical stud-framed wall with 1/2" drywall, 2-1/2" screws are a solid choice.