I'm in the middle of editing it and I had an idea: we could reenact the attack on Helms Deep (it would be filmed from the walls) - would require a considerable amount of 'actors' - 30-40. Wouldn't be as epic as in the movies, but if I added proper music, used multi shots etc. it could look decent.
Scenes I had in mind ('actors' would be running in the direction pointed by the arrows):
Red area also indicates where a breach after the explosion would go.
I was also thinking of adding Obsidian roof and walls for more dramatic effect, as well as ask participants to change their skins to LoTR oriented, but it's just an idea. I may aswell just finish the editing as it is, without the additional cinematics.