I am trying to create my own complex mod, which takes place in a new world… I have created my entrance in both Terminal and in my new world. It is a cave with an autoloader load door. My problem is that the cave doesn’t show up in game but the autoloader door works, u can see the name and load through it once close enough. However once going through the door, you fall from the Sky into the ground on top of my cave. Sometimes it loads it correctly but the world is Brocken up into cell blocks floating in the Sky. I copied Darkwater world settings. Am I doing something wrong or it a problem with the CK, is there any way to fix this? I really want to make my mod.

Your first issue with it not showing up is a known bug, Set it to use full LOD, This hopefully will be fixed soon, Second of all. You fall through the floor because you copied the door, You need to make sure the yellow door marker is above ground and not touching any objects.