My previous kerbalism grand tour mission (Lucy in the sky with deadly radiations; incidentally, I will refer to that mission a lot, as this mission is its spiritual successor, and most of my design was directly influenced by that experience) wasn't yet done, and I was already looking for the next step. Ok, I made a grand tour with kerbalism, though I did allow some slightly relaxed rules for isru. What next? What could I do for a greater challenge? First thing to mind was to do a similar gr