OK. It's early still, and I'm only on my first cup of coffee, so if I repeat any info., I apologize.
As for the Camaro/Challenger comparison.
First. They are
not "designed to be full size cars." From information gleaned from a
very good source, being based on the 300C chassis, the Challenger will be bigger, weigh more, and offer a bigger back seat which will truly seat four comfortably. It will also be built in less numbers, and only offered as a "top dog" model, with the Hemi and/or possibly as an RT model with the bigger Hemi. Seeing both in person, the Challenger is bigger.
And second. The Camaro. It will weigh less then the Challenger, and while it too has a back seat, it will be smaller.
Here are the specs.
Challenger
Wheelbase: 115.9 in
Length/width/height: 197.8/78.6/57.0 in
Curb weight: 4100 lb
Camaro
Wheelbase: 110.5 in
Curb Weight: 3,600 lbs
Dimensions (L/W/H/): 186.2 / 79.6 / 53.0