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I did this. My suggestion would be to add cardboard or something up the sides to hold water. My garden did SO WELL, but it dried out easily. Also, in the individual holes, I planted herbs, green peppers and zucchini. They did excellent also!! - Garden Ideas
Raised garden planter boxes on wheels / casters - Size is 2' x 4' each, just over 2'ft 4" tall with the casters installed on the bottom. Soil depth container is 12" and the bottom shelf has about 3" of clearance to hold drain water trays. An excellent present for some one with a small garden so that they can move them around with the seasons.