Just an idea, has anyone else thought of using housing vinyl siding material, and the plastic from those new style plastic fences as a source of material for their models. These could be cheaper and much more material for the money than buying packages of styrene from hobby stores.
When last years tornado ravaged our neighborhood area and destroyed alot of houses around us, I saved quiet a few sections of the plastic fencing from a neighbors deck fence. But hardware stores stock lots of this kind of material.