The trailers for the Baldwin tram are almost finished. Judging from old black and white photos (the tramway at Sorrento closed after Easter 1921) the bulkheads appear to be filled in with thin sheets of metal. They are difficult to do in 3D printing. Instead of trying to fill them in with thin plastic sheets I have decided the trailers will get some rolled-up blinds.
The original trailers were painted in different colours like bright red,dark red, green yellow, brown and black/dark green. I have opted for just one colour (green). I think different colours would have made the tram into an toy train from an amusement park. Instead of the colours telling the trailers apart I have numbered them 1-3.
Looking at the old photos it appears the gold lining disappeared over time. It is also unknown if the stanchions were brass (probably not, but it looks good!)
More information about the Sorrento tramways from Melbourne Tram Museum.