The kit is a modern multi-media production. Most of the parts are very well moulded plastic, with crisp detail. There's also some wire and a small fret of etched details.
To be honest,I know nothing of the prototype. The kit was bought in a model shop visited in Victor Harbour, the first of many during the trip. I picked it because I liked the quality of the mouldings and the finished model on the packet was suitable "Aussie".
To be honest, I can't do any better than point you at than this excellent web page over at victorianrailways.net so for more details, head over there.In the meantime, I'll start with the chassis.