Took a magnet outside...
Steel (magnet stuck):
Front fenders, front doors, main body
Aluminum (magnet did not stick):
Hood, rear doors, lift gate (magnet felt steel bracing in all the doors).
Front and rear bumpers, pretty sure the side skirts, that black triangle above the brake light, mirrors
Also of note, the wheel wells and almost the entire underside of the vehicle are lined with a fibrous mat material. My neighbor's newish Chevy Truck has the same wheel well linings. It was a surprise to me, but I guess it's pretty common now.