Easy Floating Alcove shelves made from Plywood

3-Second Blueprint (English)

1. Check out-of-square alcove reveals with a framing square first, planning caulked joints and in-situ painting for splayed corners.
2. Glue plywood skins over internal perimeter and center softwood battens with an 8 mm front lipping to prevent sagging without weight.
3. Trim the hollow box flush on a table saw and bevel the rear battens so each shelf slides and locks cleanly onto wall bearers.