After I had the base built I added on using the same method. Acrylic rods for the bulk support and zip ties to hold everything tight. The zipties are rated for 40lbs each, the total structure cant weight more than 10lbs.
Here is the underside of the almost complete structure. This is before the rods and zipties were trimmed. I added way more support than I probably needed but they are pretty much all hidden and I like the extra peace of mind.
Rock work was done at this point. As you can see my foot is holding it up. I wanted the rock to stand like it was in the pic so had to find a way to support it. I thought about adding more rock to the bas to act as a counterweight, bit the small footprint of the JBJ kept that from being a realistic option. I wanted a half arch so adding a rock to support the structure was also out.
My solution. I picked up a $2 polypropylene cutting bord (aka starboard) and drilled some holes.
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