I thought of making a collage of the last 2 steps (based on imagination) on how a Koetsu 'innard' is installed to its body; using Ncolble's nude Koetsu photo as a start, into a blank stone body and how it appears as the final product. The final step after checking the alignment and testing would be the installation of the gold plate cover.
View attachment 116624
I think that the glue or gluing technique being used to assemble the "case" to the structure is very critical. Can I ask what glue you are considering?