Maxx, I just read that link, and I really like it too!
I don't have a sb in my 125 prop tank and a rock fall would be scary. That type of material would be just the thing.
Looks kinda unnatural I think but I don't think it would look unnatural for long, that type of material would probably be covered w/ coralline in no time at all. (and zos, and shrooms etc.. etc...) and personally I think my dsb looks ugly under the surface along the front of the tank.
Someone also metioned using modified ugf plates. Maybe there is a use for them afterall?
Where can you get that starboard and what do you need to cut it with???
Cool link.

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240 gallon glass mixed reef 2x 250 watt m.h., 2x 175 watt m.h., 3x 110 watt vho's.
55 gallon propagation tank, 2x 96 watt pc's
Empty 125 gallon tank
reefer girrrl!