I suppose you could look at what they did for last section of Irkngthand (cell name is Irkngthand04), though I would warn however that just because they managed to do it doesn't necessarily mean that we can do it. I just corrupted the scripting for a quest I was working on for a mod by trying to implement a remove item command in the quest dialogue script (hint: you do NOT put Game.GetPlayer().RemoveItem(Gold001, 25) (with a Gold001 property on top of everything else) in the dialogue script begin or script end fragment fields AFAICT, despite the fact that vanilla quests are scripted that way). Anyway, you can see if what they did as far as cell flooding goes will work for what you are trying to do (assuming if it is obvious, it might not be), just make sure you keep a few back-up copies of all your files (I personally would go into the Skyrim data folders and physically copy and paste them somewhere else if possible, but that's just me, I don't trust applications to keep back-ups for me) before you try, in case something you do screws the entire mod up beyond (or at least nearly beyond) repair.
Also, Ninja'd, though I actually mentioned the place. Also, the quest is