Skyfactory (need help regarding the world file)

hello im trying to make a skyfactory server on your website so the point of skyfactory is spawning in a one block world that has a tree right? since i cant seem to find an option to make the world on your server a void world how else would you recommend it? also i tried making a singleplayer world with the world as a void world and uploading it to your server but it always restarts after the queue ends like it goes from loading to starting to server is offline before i have a chance to try it.

thanks i think it has been resolved