Space X Mars Mission: Kerbal Space Program - 20 Kerbals (Full Version)

Successful mission taking 20 kerbals to Duna imitating the Space X mars transport planned mission, which plans to take 100 passengers in one trip. Our ship will reuse its booster after achieving orbit, and be used to send up refueling ships. Once ready, the ship will embark for Duna, where it will land and refuel itself before taking an transit window back to Kerbin.