Suggestion: Plastics

I rather like the concept of Industrial materials, and noticed plastic based constructions weren't in here.
You could use bio/coal based fuel (clumpy?) and perhaps the compressor to start the process, probably a plastic lump/ball to be melted or pressed into sheets (8-9 sheets to a block?).
I wont go into detail about the uses of plastic, because there is quite a few possibilities.
--Nidor--