This is a Sportster Powered chopper created by Arlen Ness.  This Sportster Chopper was dubbed The Alien by Arlen Ness when it was created.  The picture was taken at the Donnie Smith Bike Show in Saint Paul Minnesota in 2007.  The style of this Arlen Ness chopper is classic 70's Sportster.  Flat coffin tank, flat custom seat and chrome Ironhead Sportster motor.  The 21" front wheel and skinny Springer tie the chopper together nicely.  Another nice touch is the molded rear fender another 70's trademark of the great builder Arlen Ness.