It has some mods, but as others have already said it is a Super Sportster.
What I see without looking to hard is ...
The gear is moved out of the wing, the engine is turned on it side with sereral changes made up front to accomodate that, and the horizontal stabilizer and elevator is squared off instead of having rounded ends, there is also a wire brace added between the vertical stab and the horizontal stab.
Oh yeah the cockpit is smaller too.
Heck maybe its not a Super Sportster after all