Well, mass drivers should be relatively easy to construct on the moon & can be used to launch fuel and resources for ship construction. Also at least some terre

Well, mass drivers should be relatively easy to construct on the moon & can be used to launch fuel and resources for ship construction. Also at least some terrestrial mining and refining techniques could likely be used on the Moon in modified form while we are still very early in zero-g mining and refining necessary for Asteroid resource extraction.