Oh wait... I have this pix to share!
My Reef Dog!
Just kidding...
This is the only shot I took of the right side, it should give you an idea of how I stacked my rocks on/against my PVC reef rack. It's only 50% completed compared to the right side today.
The gaps between the PVC reef shelves were bridged by enormous liverocks.
The emphasis was to camouflage the rack while maximising water flow through and minimise the footprint at the same time.
I spent many backbreaking hours and days arranging and rearranging then.
Hope this helps?