Print the doors with the skulls pointing down, then fix in place with the Buttons and glue those in place. Pause the print after the first few layers and switch the fillament for dual Color Effect. Also check to make sure the Doors move accordingly before applying glue.
The Dorrs might be a bit rough to use the first few times, so open and close them often to make them go smoother.
Dark emerald green + Black are the recommended Colors. I also later glued magnets in place to keep it fully closed
The author hasn't provided the model origin yet.