I tried doing this last Summer and the plants fell out. I just used garden liner, and I think that this article gives better advice. I'll pick up some coco liner instead and that will probably look better anyway!
Made out of an old door and other miscellaneous things! Altered Olives, a British Columbia-based company that creates custom recycled furniture, crafted this one-of-a-kind potting bench from an old wooden door and other salvaged items.