A new challenge appearing in the subforum really caught my attention. It's the "Duna Outpost Mission Architecture" challenge by @Death Engineering. To summarize what the challenge is about - you have to develop an outpost on Duna surface, that is capable of sustaining a permanent habitation of multiple Kerbals. Your supply of launch vehicle is limited though, and the launch frequency depends on payload capacity of the rocket - you have to plan carefully what you really need there (tricky,