Seeing as Principia is getting to the point where it is quite useable, it seems to be a good time to do this. The challenge is fairly straight forward. A space station has been placed in a magical square orbit around Mun.  The objective is to pilot the cargo vessel, which is in low Kerbin orbit, and rendezvous with the station, using as little delta V as possible.   You will need a 1.2.2 installation of KSP with a stock planetary setup, and Principia Catalan, then load this s