In the video Elon makes an estimate of a million tons to Mars (if I remember correctly) in order to establish an entirely self-sufficient colony there. Buildin

In the video Elon makes an estimate of a million tons to Mars (if I remember correctly) in order to establish an entirely self-sufficient colony there. Building orbital manufacturing would be a different kind of problem, but in some respects it's kind of similar. I suspect it'll make sense to establish a foothold on Mars first (which has a lot of necessary resources and less gravity means you can transition from the planet to orbit much more cheaply) and then maybe use Phobos and/or Deimos as manufacturing hubs for space-based hardware like habitats. Or maybe it makes sense in the short term (before Mars has the necessary infrastructure for big projects) to do manufacturing on the moon.