Now I'm going to respond to myself. But only so it will bump the thread. I think this makes the wooden dash a 'should have'.
Arboform
http://www.tecnaro.de/english/willkommen.htm?section=we
Tecnaro take lignin from the waste stream from papermaking and combine it with cellulose fibers (like, from hemp, man) to make a zero-carbon, incineratable plastic material. Less ductile than petroleum based plastics and it produces more accurate castings. With the same thermal expansion coeeficient as wood, it's apparently a great substrate for veneers and inlays.
The thing I like is it's foamable! Wooden insulated monocoque, here we come.
"ARBOFORMŽ is liquid wood"
Edit: I see Wired has an article on a plastic/wood filament for 3D printers:
3-D Printing Branches Out With New Wood-Based Filament
They're mystified by the source of the raw material. I think it's Tecnaro.