So I built a 70ton lander for Duna: http://www./?rg5pq790iggatkh (it's not particularly good) My problem is actually getting it to Duna now. This is my current attempt. I'm not sure what I can do to make my ship larger. http://www./download/al7klhgeq00rnc0/Duna_2.craft At the moment I have to use lander engines to get me into Kerbal Orbit. My other issue is that I don't have the tech tree completely unlocked. (otherwise this would be more trivial, especially with mainsails and jumbo tanks) I have all the 90 science techs unlocked plus Heavier Rocketry, Specialized Control, Advanced Electrics, Advanced Exploration, Advanced Landing, Electronics, Field Science, and Advanced Science Tech. (First two and bottom 3 of 160 science level, bottom 2 of 300, and 2nd to last 550.) I'm not particularly attached to anything but the lander if someone has a random sub-assembly that works with my technology.