I started this build with the bridge, then built up (or down really) each side of the canyon until they each was finished, then joined them together which was a total Megablocks and the most annoying part of the build but I guess that's the way you pay really for starting from the top ;-P Then I tiled the water out and constructed the waterfall. Finally I added vegetation and the actual battle scene, putting the flames and the final touches on the bridge. This build took almost all of my light bley.

Brickshelf Folder (When Modded)
Deeplink (For a bigger picture)
Enjoy, Castlers
