The couple designed the interior themselves, which Mathesius then mapped out using a freeware version of SketchUp Make as his primary tool.  A legal consultant and former state superior court judge, he had no prior experience with the 3-D modeling tool but says he quickly picked it up in a matter of weeks, noting its ease of use. sketchup.com  Photo 12 of 12 in A Shipping Container Home in Pennsylvania Embraces Its Rugged Industrial Origins