Here is a huge pic of diffrent scifi ships in scale. I inclueded the link incase it is to large.
http://www.chartgeek.com/wp-content/uploads/2013/09/size_comparison___science_fiction_spaceships_by_dirkloechel-d6lfgdf.jpg
http://www.chartgeek.com/wp-content/uploads/2013/09/size_comparison___science_fiction_spaceships_by_dirkloechel-d6lfgdf.jpg