Presenting the KSS Titanic 878 parts, 417 tons, 20k units of liquid fuel, 18 kerbals, 2 heavy landers (7 kerbals each with a 7-kerbal rover included), 4 unmanned mini landers, 4 unmanned rovers, 2 long range satellites, and a utility tug. I'll never do that again. Lag is so bad it took 45 minutes to complete an 8-minute burn to Duna, and it wiggled so much I had to spend the entire time making small steering corrections (and used up most of my RCS fuel). When I finished the initial burn I ended up undocking everything that can make orbit independently and turned the mothership into a fleet. But so far zero icebergs hit, so it's a huge success.