Apologies for the poor quality photos, but I rattled them off while the topic is still hot. As mentioned before, to anchor the concrete, I first fixed stainless steel mesh to the panel, which is 760 x 610mm. There is a gap under the mesh.
The fast set concrete was mixed to a fairly stiff paste that was applied roughly to the mesh, leaving some mesh exposed to give added texture. It is possible to do some dribbles and scratchings with a knife before it hardens. The concrete sets rock hard after less than one hour. Here is what the raw concrete looked like, with its typical pale grey colour:
The large hole is 60mm in diameter.
Here is a zoomed area to show a detail of the raw, unpainted concrete. The circle (an imprint of a plastic tablet container) is 25mm
Some angled views to show the thickness. The green part is 16mm thick
Below are some painted details, showing the raw and painted concrete textures. Every square mm was covered in paint, using normal brushes and painting strokes. The colours were mainly bluish and ochre greys, with red and green accents.
I hope I've explained the process and technical details clearly.