Today I am going to use the above plugin to create the main world of GT6 and hell. After the creation, there is no GT6 and no GT6 minerals. Even the rock layers are original, so I want to ask how to create the world of GT6.

Uhh you use a Mod or some Bukkit/cauldron/whatever Plugin? What do you expect? I cant even support any Plugins due to their nature of breaking everything very badly.