Raised bed/planter/fence/privacy screen: this is now featured at http://www.instructables.com/id/HOW-TO-BUILD-MULTI-USE-RAISED-BED-PLANTERS-WITH-PR/ with complete instructions for building a planter with a back 48"H. You can get a PDF too. Please vote for me in the "Outdoor Structures" contest. Thanx!!
Step by Step Instructions on how to build your own Privacy Screens