Here's How

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  Step 1: Cut 3 panels to sizes required. Cut along a straight edge, clamped in a position to allow for distance between saw blade and edge of saw base.
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  Step 2: Sand panels and bedside table after taking off drawer knob. Cut the 2 spacer blocks, then glue and screw to top of cabinet so they’re flush at back, and sides allow for any rounding of the cabinet. Undercoat cut pieces, as well as cabinet and its blocks, ready for the finish.
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  Step 3: Referring to Child’s Desk Diagram (above), mark in position of modesty and leg panels on underside of top panel. Set modesty panel 110mm in from back and 40mm in from leg end. The leg butts against modesty panel and is 10mm short of top edges at front and back. Predrill pilot holes and screw leg panel to modesty panel so screw heads are just flush with surface of timber. Screw top to leg and modesty panel. The modesty panel also acts as a brace for leg.
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  Step 4: With cabinet upright, fit desk assembly on top. Align so end of modesty panel is flush with back of cabinet. Then screw top to spacer blocks. To paint desk in several colours (here Alien, True Red and White), remove top from cabinet to paint them separately. Replace original drawer handle with a ruler, held off drawer face with short pieces of dowel.