How many of you guys have even sat in an ATS? It's a verrrrrry small car compared to the Camaro.
Just make sure you realize that with the lower weight would come Cruze sized Camaro.
Also Ford's use of aluminium is nothing special. GM was way ahead of Ford in full size pickup weight. Ford had the catching up to do. And aluminium panels are more expensive to replace and repair. Insurance costs "may" be impacted by this choice. The market will tell, but GM had aluminium panels on many vehicles and removed them (Liftgates for example) because the cost benefit wasn't there.