[RWebb]

masonite will fall apart with water intrusion or even "heavy" moisture - it adds some wt. as well if you care about that

luan plywood is what was used decades ago, but modern foamed plastics are impervious to water & are used in modern cars

appbiz cuts them perfectly to size out of the modern materials

I understand if you are not enthralled about paying shipping half way around the planet, but there must be something similar down under one could use.