theres all types of plastics you can use, PVC aka Chlorinated Polyvinyl chloride, Polythylene, polystyrene, many different types of Acrylics. but most of what you talk about is injection moleded at one point or another. your best shot would be polystyrene sheets or pvc sheets and you can heat them with a heat gun and they become very moldable.
oh and jseber1982 u should give me a link to see you machine, pretty mean monster, would love to see it, the link for my beasts are are in my sig, and that is my old machine, will have new pics of my sig in a few days.
OH to add to my sig like yours, lol i work at intel.