Another Lego builder points out that it's tough to make this set without it looking like "a cleaver through a wedding cake." That's the truth - I was only able to really fit 6 of the famed 7 levels without losing the overall 'point' of the model.
The top features the famed courtyard through which the original Burning Man takes place. I couldn't find a convincing White Tree of Gondor (I even tried a minifigure hand!) that didn't obscure the overall detail of the model.
The movie model, the collector's edition model and paintings all vary on what exactly is built on the mountain top, so I took some creative liberties with a spare One Ring piece I had lying around.
The Nazgul riding a Wyvern is actually holding on to a Lego Fiber Optic piece.
The Orc army features several siege towers, and the battering ram "Grond."