So if you start in the elevator with doors closed (ie. thats how they should be in your level editor before you hit play), you can have your first level load in the construction script … just load whatever level should be there at startup with block on load set to true, you can then open the doors or have a timer before they open.
Then your current process for pressing a button and triggering door closing, unload current level, load new level, open doors seems to be ok …
Am I missing something?