Using the laser cut plaster as a mould for the clay shapes is working reasonably well. Some particles from the plaster do come off on to the clay which is not that noticeable on the white clay or the porcelain but is on the red clay. I might look into putting a coating of wood glue or varnish over the cavity so it will keep its shape longer but not compromise the surface finish.
I am thinking of using porcelain for the charms that are not the most attractive eg: mobile phones, switches. I think it will make a good contrast between this very fragile decorative material against modern mass produced products. On the porcelain I am going to put ceramics transfers of delft patterns.