Here is a station I built, It\'s not the largest but it features 2 docking ports, plenty of RCS fuel, two batteries, an ion engine, pressurized storage, a large crew compartment and a small station module. It weighs around 30 tonnes and is designed for inter-planetary travel.. Here is the launch vehicle: on the moon and in orbit with a crew vehicle. The actual station is unmanned.. when docking is possible in KSP I plan to have a lander and a crew module dock with the station. The station is capable of reaching escape velocity, and from there it just needs to accelerate for an hour or two to reach trans-planetary velocities. sorry about the image size, I\'m not sure how to down scale it using the forum settings.