I had a thought earlier today that having a shipyard or constructions spacestation for the arrow in earth orbit would make a very realistic scenario. I was thinking a station in which the arrow is attatched but not docked so it would have to jettison from the station when it is prepared to leave, maybe some docking ports on the station itself because the workers need to get there to build it. I think it would be very realistic to fly up to the station in a DGIV with the flight crew and dock to the arrow and then jettison off from the station to embark on your journey. Maybe make the station MMU compatible so you can shuttle workers and flight crew up there?? anyway just a thought