Thanks guys.
Bill, no Koi, or goldfish, I REALLY dislike those fish. Dont know for sure what to put there, but probably will be some natives, really like these, Notropis lutipinnis, yellowfin shiner:
Maybe a Turtle instead, red year slider or something similar, like a Map turtle.
And there are two retaining walls, so all around the "falls" it will be planted heavily, going with swamp plants (already in there) to marginals and then terrestial plants around. The walls will be barely visible in the end. It's a HUGE hill in my yard, about 40 feet tall or more. Had to move it back by doing terraces so decided to make them special.
The rock was all cut on site, from big slate pieces. Two types the gold one and the "black" one, were used and were all cut into strips that were then laid out by the designer to make the falls. Pretty breathtaking stuff in real life, and incredibly done in 2 weeks. I will post some pictures from the build period later.