Its been a while but I finally got a start on the stream part. Given that my talents aren't in carving I've gone away from making the stream out of the black pond great stuff. Instead I found a hamster tube (it splits in half so I had 2 pieces to work with in case I mucked one up), and I was able to distort it using a heat gun. I had one of my students help with the twisting, so the shape that he came up with I'll work with. Now I'm going to silicon some rocks/sticks into it to make it more natural looking.