From
DC Watch Japan [Google translate], an interesting report that the Nikon D5300 has a fully plastic ('Carbon fiber composite material with a thermoplastic resin') body and chassis:
Quote: The 17th, Teijin has announced carbon composite material of their own "Sereebo" (Seribo) has been adopted digital single-lens reflex camera Nikon "D5300".
It abolished the chassis of the body inside, D5300 is adopted monocoque structure to structure integral box-shaped cover configuration. Sereebo was adopted in this section monocoque structure. According to Teijin, Sereebo to have been actually used D5300 is the first time. The Nikon, you have to have been able to achieve both strength and reduction in size and weight.
Interesting. My NEX-F3 is also almost completely composite plastics inside and out too, including the chassis, I think. Sony did it for green purposes (recyclability) as well as lightness etc. Might be a trend.
I just hope these materials are stable at high temperatures (think car interior on a hot day), and durable in the long term.
It's a reminder I guess that most digital gadgets (cameras now, mobile phones notoriously, PC's) are ultimately all just disposable and good for only a few years use before being obsoleted and trashed.