Is the metal used to make fizzy beverage cans useful in modeling? What about other waste metals like the cans vegetables come in? And as for cardboard, what makes the best manipulatable and structurally sound material? I figure "dense" and "thin" are what's in this season - specifically cereal and mac&cheese, not so much shipping and pizza boxes. I'll be needing logs as well - do real oak branches work? What about crate myrtle branches? Any other tree I should be on the lookout for? Is there anything that needs to be done to them in order to preserve them or enhance their scale appearance? I have access to virtually unlimited quantities of packing peanuts - though I plan to use expanded insulfoam type materials will I also find use for the packing peanuts? I suppose I also have a pretty good supply of the bead foam board, but having cut some up recently for shipping something I'm fully aware of the rediculous mess it makes. Any other free materials I should be keeping an eye out for?