Well, it wasn't designed SPECIFICALLY for a lunar mission. It was really designed to service orbital stations, and the thinking behind those orbital stations was, in part, that they'd be waystations for trips to the Moon and to other planets. This was Von Braun's dream, really, and he imparted it to lots of NASA folks during his tenure.<br /><br />There's no full set of plans, but lots of ideas have been tossed around. Not much since Nixon, though, at least not at a high level where it stands a chance of getting funding. <div class="Discussion_UserSignature"> <p> </p><p><font color="#666699"><em>"People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint it's more like a big ball of wibbly wobbly . . . timey wimey . . . stuff."</em> -- The Tenth Doctor, "Blink"</font></p> </div>