Hi all,
some time ago I had started with the rock section between the walls.
Only as a styrofoam block, but I now cast a few rocks to try and complete this.
First place a few castings in place to get a feel for it.
Pic one.
Then today on the garden bench I fitted these castings with plaster of paris.
Pic two.
Last two pics of the rock formation in place to check for fit.
Still needs some work.