The holes on the bottom are in the shape of the base rock. I stuck zipties through pre-drilled and existing holes in the base of the rock and then threaded the zipties through the holes in the cutting board. Drilling numerous holes made threading the zipties through super easy.
Here's a view from the back of the structure. You can see the zipties going into the rock and then through the cutting board.
Here you can see the rock structure being suspended from just the zipties. Like I mentioned each can support ~40lbs and I used around 8. Also used the black zipties to help them hold up to the UV exposure from the lights.
Here is the finished product. I glued some sand to most of the exposed zipties to conceal them better. I also used two-part epoxy to attach pieces of rubble over some exposed acyrlic rod and zipties. I also used epocy between the main pieces for added strength and security. Probably epoxied 7-8 small pieces to the main structure.
The cutting board turns the structure into a cantilever of sorts. The rock structure wants to tip, since its attached to the cutting board it pulls the cutting board up at the base which pushes down at the far end. The cutting board presses against the glass preventing it all from tipping over. Maybe this picture will help show how the force is transferred from the structure to the glass
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