Thanks Mike. What I am after is more like upper kitchen cabinets without doors or back. They will be approx. 4' off the floor, 5' wide and approx. 4' high without a back. Shelves will be 15" deep with spacing of approx. 16". Should I make two units approx. 30" wide? and specifically how should I mount them to the wall. This is a pantry and will have canned goods, paper products, cast iron frying pans, etc.