I didn't get a response from the creator of the Splatterhouse video, but I've put together an initial build for this game with the device, packaging and instructions which you can preview here. I've also listed it in the help wanted section on RetroLab hoping someone from the community might be able to help.
Viewing post in Suggestion: Splatterhouse LCD Game
Awesome! Here's some other videos I've found showing this game off that might be of some help to you.
https://www.youtube.com/watch?v=mXaf1jvPVdQ
https://www.youtube.com/watch?v=X-6kGoAmYjE
https://www.youtube.com/watch?v=wEqR6QBR_WM