Ive been progressing through career mode and the mainsail and big rockomax tank are available for unlock. I have roughly over half of the science required to get it (something) so I need roughly 200 more science. Ive been to Mun and Minmus twice, with plenty of temp readings, science lab experiments, goo observations, crew reports, eva reports and surface samples. I probably messed up and chose to unlock advanced metal works thinking I needed it to unlock the mainsail, but I was wrong. Ive explored all of Kerbins biomes except maybe mountains, and Ive been to the Muns highlands, and midlands, and on Minmus I got samples of the hard rock and frozen lakes. Being that I have access to clamp-o-trons Ive thought about launching a lander and transit stage and rendezvousing in HKO, but its proving difficult. I can build a manned rocket to orbit kerbol, but Ive nerfed my science gain from my probe I sent to duna while it was around Kerbol. So a manned mission really wouldnt bring home that much science, would it. Im open to suggestions, pic of my tech tree so far