This is an interesting way to present Wabi Kusa. I called it the "Sandwich" myself, not by meaning to be respectless. It was a funny look in the Preview. I think I like your use of Hardscape, but I wished Planting would fit to your creativity here - Still a very nice Job, congratz!

I love Hydrocotyle tripartita.

An original design although looks like quite young and not established in my opinion