I built my stucture with fijicrete and moved it after, but I used zip ties to hold it until it was cured then cut most of them off. I left a few zip ties hidden in the rock work for insurance and also there is an arcylic rod supporting some of it. When I drilled my rock I used a masonry bit and used a regular half inch drill and went really slow and let the bit do the work. I tested drilling the rock on a few extra pieces before i did my main structure.
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