a Modding question? on rebuilding whiterun after the war.

[Raider1]

I've been working on a mod for a while now, one of the things this mod does is disable much of the debris in Whiterun after the war and enable new meshes.  Like buildiings, walls, trees etc.  I'm using a quest to do it at the moment but I'm not sure if there is a better way.  So how would the rest of you do it?   Scripts and triggers, or is there a better way I don't know about.