New Lagoon Set up...

[Zoaelite]

I think it would look amazing if you could have a little extra room on the top, too many tanks nowadays are build with an open top look. If you put it at 14 inches of water (which should be fine without the Eurobracing) and build the rock work "out" of the water you also have the amazing opportunity to create a "coast line" for your "shallow water laggoon" (Please note I like "finger quoteing"). If you do some research and find some plants that can tolerate high salinity (Mangroves and certain bamboo's) your going to create something that I personally have never seen. Perhaps a little research is in use as you could also have some tidal zone creatures that live half and half?
Just my 2 cents.
Levi

OOOO EDIT~!- What if you incorperated not only a few powerheads under the water but a few powerheads that direct water right onto the rockwork? Perhaps a waterfall or two. Not only would you keep the above water rock wet but you could also use that to grow your mangroves?
Levi