The World Tools Mod is a super easy block editor giving you the ability to quickly create or destroy blocks within a set of coordinates. It’s geared toward creative mode building and aims to aid in massive structure building. Your first tool is the cursor and that’s what you’ll use to create two points. Right click one block to set point 1 then at another block right click again to set point 2.
With the eraser you can take some new coordinates within the newly filled blocks and hollow it out. Or you can take a whole new area and erase any chunk you want. Streamline your mine by hollowing the ground all the way to bedrock.
You can even copy and paste coordinates with the copy and paste tools. Just set the desired coordinates like before and then copy with the scissors. Then with the paste tool right click anywhere you want your copied blocks to be.