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Decide the desired size for the recessed shelving unit and the approximate placement on the wall. Avoid putting the unit directly above or below wall switches, outlets or lighting fixtures; this will make it easier to avoid the electrical wires in the wall. Find the location of the wall studs (normally 16 inches apart); the unit needs to go in between studs.
Use a straight edge and a razor knife to score the drywall. Use a hammer to knock a hole in the drywall inside the scored outline. Look behind the drywall to check for wiring and other obstacles.
If no obstacles are in the way, use a drywall saw to neatly cut around the scored line in the drywall. Avoid any electrical wiring while cutting the drywall.
Measure and cut the plywood for the shelving unit. For our project, we used plywood with pre-cut grooves for the sides of the unit to accommodate adjustable shelves. Plain 3/4" plywood was used for the top, bottom and back of the shelving unit.
Tip: Cut the grooved plywood so the grooves will line up when the piece is assembled. If the grooves are off, the shelves will be crooked.
Use wood glue and a Brad nailer to assemble the box. Add decorative wood trim around the face of the box; this will cover the raw plywood edges and will help hide any gaps between the box and the drywall.
Sand the shelving unit and trim, then either stain or prime and paint as desired.
The support behind the wall to hold up the shelving unit will depend on the weight of the unit and what you plan to display in the shelving unit. If the unit is heavy, attach 2x4s to the existing framing to add extra support in which you can nail the shelving unit onto. Line up the 2x4s to the edge of the drywall opening. If the unit is fairly light, slip strips of plywood behind the drywall, lined up with the edges of the hole. Secure these to the drywall with screws.
Slip the box into the hole in the drywall. Either nail through the sides of the shelf into the 2x4 framing or secure the box by nailing through the front trim and into the plywood strips behind the drywall. Check the unit for plumb and levelness.
We purchased a sheet of acrylic which we were able to cut into six shelves. Home improvement stores can pre-cut the acrylic for you. Remove the protective plastic and slip the shelves into the grooves. Use double-sided tape to adhere small, battery-operated lights to the top of the unit to better show off your treasures.