Just did one thing today... poured Hydrostone into the river bottom to create a level surface for the epoxy water that will follow.
I had purchased a mixing head from Harbor Freight for my DeWalt, but up until now never used it since my batches were too, small being mixed in cottage cheese containers. Today, I mixed the plaster in a paint container and made good use of the power mixer.
It took five pours to fill the entire cavity, and as you can see in the pictures, because of the plaster's viscosity, the edges are a bit high. I'm going to use some more sculptamold tomorrow to blend the edges into the surrounding terrain...perhaps with some more rocks at the edges.
Kind of looks like a lava flow...
But it is level and reasonably flat. The epoxy "water" will level it some more.
Adding more sculptamold tomorrow will push off the painting another day or so. I can work on the station. There's always something to do.