I'm going to build several bases to hold a Planet Hopper class shar ship. One on Earth (4 runways, 2 4-mile, 1 5-mile, 1 2-mile), one on Mars (1 runway, 1 1-mile) and one on the Moon (1 runway, 1 1-mile). The one on Earth will be a complete space port ready to carry almost any vessel. The one...