Check this out: http://www.kiengineering.com/Inventory.html http://www.kiengineering.com/Inventory.html This is his site and has bigger pics. You'll see how he

Check this out: http://www.kiengineering.com/Inventory.html http://www.kiengineering.com/Inventory.html This is his site and has bigger pics. You'll see how he used the wooden frame.