Finally added in the foundations for the front bridge which spans the gorge, hinting in detail that they are cracked and about to be washed away by the river. Match color saved my rear end here, my rubble isn't quite the same color as my walls, so I fixed that.
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If you look close you can see the trouble I'm in memory wise. It tends to crash when I'm at about 1.2G of utilization. I'm going to try and make a layers smart-objects so I can export them, and then place them back in the scene when I'm ready for them.