Teleporting Doorways!!!

[Cranky Old Man]

I'm sure that there are competent people here that will help you with your problem, and as the door closes before the scenery changes, you're not asking for actual portal mechanics either.
...but take a step back and look at what you're asking:

"I'm definitely planning for this custom story to be completely original."
"I'm going to have <insert extra-dimensional scripting problem here>, it's large, surreal, and almost ridiculous."
"I want to know how I can do this."
"After tons of searching for the answers I was not able to find the right help for what I want."
"I think I should check with some experienced people in order to obtain the proper instructions."

The reason why this would be completely original, is because it takes a competent programmer/scripter to pull it off. Don't go "It's going to have X." until you know that it's even possible for something to have X.
How much progress have you made on your idea?
Have you made the level parts yet?
Have you made ONE level part yet?