Finally got my first Kethane extractor and refinery down on the Mun. I found that the 4 rtg's we're sufficient to constantly power the two large drills when extracting nor to constantly power the converters. But I managed to fill up, fully refuel the rig and then fill up with kethane again. I then was able to launch, rendezvous and dock with Harmony Station (my Mun station) carrying a full load of kethane. Tonight I'm going to design a refinery and storage module for Harmony. This will launch and rendezvous with the tug docked at Rhapsody Station (my LKO station) and then on to Harmony. Then a probably redesigned surface extractor with more power and I'll crash the old one on the surface. The long term goal of all of this is to allow the Mun to act as my refueling point for interplanetary craft. Once that's done set up a similar one around either Duna or Ike, which will be called Symphony Station.