Here's another pic I forgot to add last night. This was the odometer reading sunday morning
The wing is attached through the vent panel but anchors above and below the vents on the curved body work. I've been able to hang on the wing (I'm 230lbs.) without deforming the body work so I think it's pretty strong. The primary function of the wing is to reduce lift not provide additional down force. Similar, but nicer, wing designs provide up to 1100 lbs. down force at 100mph, but the beetle shape creates almost 1000lbs of lift at the rear axle at the same speed so it's almost a wash.