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I would also suggest using Duplo bricks for an under-structure just to fill space efficiently and cheaply. Then cover with regular Lego in the earth tones you wish to use.
I'd also suggest not using the filler and BURPS like he does. 1x8 and even 1x12 arches are pretty cheap. I like to use those, along with 1x1(or2)x5 bricks (with supplemental smaller bricks if needed to get the right height) to create "caves" behind the rock face. With a little care, the insides do not have to look ugly. Then you can use these either as a display if you turn the model around, or as a storage area for minifigs and small builds.
Google "Lego Batcave" and take a look at what these guys did so some inspiration.
ps.: i always started making disasters, infact :-)
This was a timely discussion. I am trying to recreate Lisqr's Minas Tirith. I've got the "castle" part figured out, but the back with the round rock formation is a major challenge. Those Burps don't look like they will work out. @CCC's arches suggestion sounds like my next attempt. Any brilliant suggestions are welcome!