This section is from the book "Box Furniture", by Louise Brigham. Also available from Amazon: Box Furniture.

Same as for Magazine Rack, Illustration No. 32, with the addition of doors, etc., also as follows:
Doors. 3 Pieces 1/2 in. thick, the width 2 In. less than the outside width of the box, and length equal to the outside length of the box.
Cleats. 6 Strips 1/2 in. thick, 2 in. wide, about 1 ft. long to cut for door cleats.
Hardware. 6 1 1/2 in. iron hinges (butts) with screws which come with them. 3 small door pull-knobs. 3 brass buttons and screws.
Proceed the same as for Magazine Rack. Fit the doors and put the elects on about 3 inches from each end. They must be so placed as to clear the shelves when door is closed. Mark on the doors the position of the hinges, say about 4 inches from both top and bottom; cut out the edge of the door enough to let one side of the hinges in even. Set the door in place and mark the leg and cut that in a similar way. Screw the hinges to the door, then set the door up and screw to the leg. The outside face of the doors will be even with the face of the legs. Place the pull-knobs about one third the distance down from the top of the door and 2 inches from the edge. Screw the buttons on the facing strips at the same height as the pull-knobs.
 
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