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

Body. 1 Salt Box (about 4 in. deep, 4 in. square).
Legs. 4 Strips 1/4 in. thick, 3/4 in. wide, 11/4 in. longer than height of the box. 4 Strips 1/4 in. thick, 1 in. wide, 11/4 in. longer than height of the box.
Trim off the three sides at the top of the box which contain the grooves that hold the cover. The top of the box will then be level or even on all sides.
Make the legs 11/4 inches longer than the height of the box after it has been trimmed.
Place and secure a leg at each corner, keeping the top of each leg even with the top of the box. Use wire nails 1 inch long. Sandpaper and fill imperfections with putty, and stain or paint any desired color.
Note. The Miniature Flower-boxes as shown on the table in the Dining-room Interior are made with the legs projecting 5/8 of an inch above the top of the box as well as 11/4 inches below.
 
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