Thread summary
Deathwing and baby_batchoy introduced Divine Fire, a cinematic saga built from every tileset in Warcraft III, and shared early screenshots (hosted on another site, and long gone).
Most of the replies turned into practical World Editor advice. To place doodads such as arches closer than the editor normally allows, hold Ctrl and nudge them with the arrow keys or the numpad (Num Lock on). Page Up and Page Down raise or lower an object to make it float. Another member showed an underground cave test: a dome built from rock-arch models, filmed with the camera below ground level.