i use fiberglass rods from menards ( found next to the mail box) and the big bottled of superglue gel from SWE
get a drill bit that is the same size or little larger then the rod
i found it is much easier to start with a big rock, as a base
was having to much fun and did not take much pic (it was hard work trying to hold a 20lb rock in one hand and glue with the other)
Very nice, I like the way you did it and I think the 3 hours were well worth it. I was going to use the rod method in mind but most of the rock was too thin to drill so I went with stacking and using that green and gray reef putty/epoxy to make sure everything was stable.