From Scott Lowther's USSP #04 The intention of this mod is to provide the parts to build said craft.  Keep in mind this was a module for landing on Mars and not staying for months.  It's small and cramped, used a fairly horrible oxidizer, and in short, wouldn't be used today.  But, the basic design has persisted.  See also http://www.projectrho.com/public_html/rocket/realdesigns.php#id--North_American_Rockwell_MEM At the moment I'm just planning on the base MEM design itself.  The va