Brian thanks for the pic.
What I am referring to (not sure about Albert) is a bit different though. In your pic, you basically have a PVC support structure so that you can get a larger reef wall without needing as much rock.
What I am referring to is drilling out the rock, and putting PVC inside the rocks, and connecting the PVC so that you can get rock to connect and be supported in ways you couldn't otherwise.
There was a great example of some rockwork done on RC but I can't find it right now.
WIth a PVC sub-structure as pictured above you want to be carefully to have good water flow through the substructure or you will get detrius build-up.
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