Freeform Design

The Minecraft Structure Planner allows you to design anything you wish through the Freeform Design Tab.  Load other peoples designs, import MCEdit schematics from the web, or just let your creative side show using the palette of available block types.  The new version of the design tab also allows you to add and remove rows, columns and layers, as well as trim your design down to the minimum size possible, and copy/paste between layers.  Finally, there's an expandable/collapsable manifest panel which shows you exactly how much of each material you'll need to build your design.