Before soldering the circuit, I 3D printed the shape of the ghost. You can download the stl file from here.
2
Soldering the circuit
The schematic is a very simple one which you can find here.
3
Potting
Adding the silicone was a bit tricky, because of the air bubbles. I tried heating the ghost hoping the bubbles would rise to the surface, but it didn't work as expected.
Thanks! This was my first attempt at using it. This is the silicone I've used: https://www.tme.eu/en/details/e43-90ml/encapsulating-materials/wacker/. Not the best choice, but I couldn't find an epoxy one. The one I've used remains elastic after drying and so far it didn't seem to affect the circuit.
Tidy project. Horrible pun.