trust me right now i have a craft that looks kinda nasty, uses Down under and silisko parts. parachute<SAS<Command<Decoupler<Mei Long Fuel/Lander< Decoupler<2m PT-4E Tank<LV-X850(Secondary long term low use engine mostly insertions)<4x Long Decouplers< FL-T800 fuel tanks<4x 2m PT-4E Tanks<4x LV-X850\'s So far ..ive reached orbit, munar insertion, and almost a landing..but ran out of fuel just short of full insertion..too fast >_<