You know, the internal skeleton idea, that is exactly how a WilderNest is built... There is a molded in steel frame that is pretty strong and does not flex much normally. In fact it only deflects about two inches when it must hold up the weight of a truck, so a few hundred lbs is no prob.
"Stand your ground. Don't fire unless fired upon, but if they mean to have a war, let it begin here." -- Capt. John Parker