One thing I question is all of the materials that originate from petroleum, like polymers. I'm sure there's sufficient quantities of ore on other planets but anything made from polymers is going to only come from Earth. Are we just shipping the precursors to the moon and Mars or are we sending polymer products (Kevlar, Kapton, Tefzel, pretty much Dupont's entire high reliability catalog) to these places? Many synthetic polymers still rely on precursors that come from petroleum. It would require significant changes in how we produce many of the products we take for granted on Earth to be able to make them off-earth without just shipping massive tankers full of chemicals.