I built these simple shelves for the powder bath and downstairs guest bath at the Utah house. Both are made from poplar, joined with biscuits, and painted white semigloss. The left unit is about 25" high, 18" wide, and 6" deep and is mounted above the toilet in the powder bath. The unit on the right is about 48" high, 18" wide, and 9" deep and is mounted in an alcove in the downstairs bath; it's wide enough to store towels, etc. The adjustable shelves ride on hidden plastic supports. The middle shelf in the larger unit is fixed.