Step 3: Install the corner blocks

Set the blocks at the corners of the frame so that the outer edges extend slightly—and equally—beyond the plywood and the inside corners overhang the mirror. Glue and nail the blocks in place through the plywood, being careful not to nail into the mirror.
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    Tools List

    • circular saw
      Circular saw
    • hammer
    • hand clamps

    Shopping List

    ½-inch plywood Get a full sheet

    ¼-inch hardboard Get a 4x4 sheet

    3-by-4 foot mirror

    3-inch fluted door casing Get two 8-foot pieces.3½-inch corner block Get four.

    3d finishing nails

    Wood glue

    Mirror adhesive caulk