The rock was sourced from a bonsai friend. It was identified as petrified wood but not such that it was completely petrified as the rock was softer than you would expect petrified wood to be. I’m not sure this assessment was accurate?
A local Stonemason who specialises in sandstone was able to cut the bases flat and level for me as the stone was relatively soft.
The rest of the photos show its creation, its display in my garden and its display at our local Bonsai Show as part of a Penjing feature.