hello i want to make a denconstructible garden shed that i can erect and take apart easily to move it to different locations. i want to make it from something like large plastic planks and joists, i want to be able to saw it and drill it like wood. it will be held together by nuts and bolts and screws. anyone know where i can get plastic building material like this, and what it is called? i don't want a tent nor a metal shed from argos