In the early 80's, we made a lot of parts from Phenolic material, which can be had in many different formulations, depending on what you want to do with it. It is non-metalic but machinable.
this is a good explanation site.
I specifically remember using a lot of the light green and tan material, and we made rocket guidance housings and gimble blocks out of it.
"There is one thing which gives radiance to everything. It is the idea of something around the corner." -- G.K. Chesterton