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Step-by-step build — 5 steps. Also available as a print sheet.
Cut the two side pieces from the 1x12 with a jigsaw, using the diagram as a guide. Use the first cut piece as a pattern to trace and cut the second. Sand both edges so they match.
Attach the bottom supports between the two sides with screws and glue, using pocket hole screws or 2" wood screws with a countersink.
Attach the top supports to the sides the same way as the bottom supports.
Attach the two tread boards on top of the assembled supports with screws and glue.
Fill any screw holes with wood filler, sand all surfaces, and apply primer and paint, or stain and poly.