Translations:World Domination with OpenBlocks/19/en

Building Guide
The building guide will give you an outline of ghost blocks in different shapes and sizes that'll help you plan out rooms. You can shift-click the guide to change the shape, or you can whack the different sides to increase or decrease the size. When in creative mode you can place an obsidian block above, then hit the building guide with any block you like to automatically create the shape.