That pic is Sunil's Mound. His idea for the hump in the bottomscape.

Ewest prompted me to use the zip ties. I was worried for their longevity and he reassured me that he has used them for similar applications with good long term results. So far, so good.
The other excellent tip was from Theo Gallus who told me to put a cluster near enough to shore to be able to cast to it (ere go Theo's Cluster) Major score on that one, too.