I've completed the first of the four reed banks, here with a figure, for scale. The figure is standing where the water will be. The image is clickable.
I'm very pleased with the effect, but they are quite a bit taller than I'd anticipated! I could have cut the feathers smaller, but then I'd have had to waste a lot of material. So these reeds will remain huge: think Nile, or somewhere deep in Darkest Africa...