I don't know what the handle and doors are made of but just heard back from Vikings Blade. My question to them was in relation to modifying the orientation of the safety bars on the Chieftain to make the razor more aggressive, and they said:
Since mid 2017 our baseplates are now constructed from zinc alloy and they should not be modified in any way.
Since mid 2017 our baseplates are now constructed from zinc alloy and they should not be modified in any way.