Measure the length and width the canopy will cover. Personal preference will dictate the area, but commonly the canopy covers to just outside the bed's edges.
Transfer the measurements onto four 2-by-4 boards, two for the length and two for the height. Cut the four pieces and sand the cut edges with a hand sander.
Place the four pieces with the longer sides on the left and right, parallel. Place the two boards that measure the width of the bed at the top and bottom ends of the longer side pieces.
Line the pieces so the ends are flush and attach them together with C-clamps at the joint. It will be easier if you insert a piece of scrap wood over the top and bottom of the joint and tighten the clamp over them.
Drill pilot holes through the two side pieces into the two end pieces, two holes at each joint.
Attach the pieces with 3/4-inch wood screws.
Measure the last two 2-by-4 boards to the same length as the top and bottom pieces, the measurement for the width of the bed. These are support frames.
Insert the two additional 2-by-4 pieces into the inside of the frame by measuring 2 feet from the bottom and 2 feet from the top of the frame.
Attach the two support frame pieces with two wood screws into each end.
Drill a pilot hole into each corner of the frame. Insert an eye bolt into each pilot hole using a screwdriver inserted into the eye while turning.
Measure the distance between the two eye bolts at the top end of the frame. Measure this distance out on the ceiling and make a dot at each point.
Repeat for the distance between the top eye bolt to the bottom eye bolt. Make a dot at the location for the bottom measurement. Then, measure between the two bottom eye bolts, and transfer the measurements to the ceiling.
Drill pilot holes at each dot in the ceiling and screw in threaded hooks at each hole.
Measure from the hooks in the ceiling to the floor and add 1 1/2 feet. Cut eight pieces of fabric this length.
Hem the raw edges of each piece of the fabric.
Place the frame on the floor. Measure 2 feet from one end of a fabric piece. Turn the fabric so the hem side is up and staple the fabric to the top, narrow edge of the frame at one corner with the long end of the fabric toward the outside of the frame. Repeat with the rest of the fabric panels so there are two pieces of fabric secured to each corner, each stapled in an opposite direction.
Hang the frame from the hooks in the ceiling and fold the short end of the fabric over the frame to drape along the outside and hide the staples.
Cut 2-foot lengths of ribbons and tie the fabric panels together at each corner.