did you take a look at "Bleher's Biotopes"? He may have one that you're looking for (a pic) on the website. I'll try to post up the link. Sounds like a cool project Good Luck!
EDIT: link- http://www.aquapress-bleher.com/index.php?option=com_content&task=blogsection&id=15&Itemid=64
EDIT: link- http://www.aquapress-bleher.com/index.php?option=com_content&task=blogsection&id=15&Itemid=64
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