I am starting to build a new modpack and would like to use your mod but i do not want it to be a void world.

What I am looking for is something that will make a complete world but from the bedrock up to lvl64 be nothing but sand even when you gen new chunks. the end and the nether will still be void and spawn the fortresses.

The mod pack will be centered around ex-nihilo and have a story line.

is this possible to do with your mod?

Custom Flat Worlds will do what you want.