So you want a more aerodynamic leaf and you have a 2013 laying around and an insight..... lets mash them up!!!
http://ecomodder.com/forum/showthread.php/project-nissan-leaf-drivetrain-into-02-honda-insight-30966.html
CdA from 6.94 to 5.10, weight down by approx. 1000lbs. Smaller tires so...