Each of these stackable shoe racks holds two rows of shoes (so it's about eight pairs, total). They are exceedingly simple to build: just cut the parts to size, pop a few dowel pins in place, predrill for screws and drive them home. Adjusting the width to match your closet is a no-brainer: just don't go over about 3 feet wide as they may sag a little over the years. Try two narrow racks instead.

Shelves

Approx: 11-3/4'' x 5-1/2'' x 36'' wide