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

Body. 1 Butter Box (about 101/4 in. deep, 133/4 in. wide, 141/4 in. long).
Legs. 4 Strips 1/2 in. thick, 11/2 in- wide, 4 in. longer than depth of the box. 4 Strips 2 in. thick, 2 in. wide, 4 in. longer than depth of the box.
Facing Strips. 2 Strips 1/2 in. thick, 2 in. wide, 11/2 in. longer than outside width of the box. 2 Strips 1/2 in. thick, 2 in. wide, 11/2 in. longer than outside length of the box.
Make the legs 4 inches longer than the depth of the box with the cover removed.
Remove the cover of the box and nail the legs to each corner, keeping the tops of the legs even with the top of the sides of the box. Cut the ends of the facing strips perfectly square and nail them in place, as shown in illustration, allowing their inside edges to project 1/4 of an inch over the inside face of the sides of the box.
 
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