I have actually read through those links and got some good info there. I'm trying to keep my costs down a bit (and don't have easy access to big rocks), and I ran across these tubs that looked pretty good, but it sounds like they will be a bit too small?

I got the round tubs at Lowes. I think they also carry rectangular plastic tubs for mixing concrete that are more like 36" long. I guess I could look into those instead. What I liked about the round ones is that I figured I could set them inside tires to make it easier to plant them on the steep slopes. The larger recangular shaped beds may require more work for me to get them in on the 3-1 slopes that are still exposed on the pond.