The spot chosen should get as much sun as possible. If the soil is at all heavy it will be necessary to improve the drainage. This is done by digging out an area one foot deep and mixing in a layer of stones, broken bricks or gravel into the subsoil.
Vertical Succulent Garden by floragrubb: 20 x 20" panels with 45 slanted cells to support planats and soil when mounted vertically. The unit in the picture is made of 6 panels, each $79. Now, if I could only figure out how to make the panels myself..