Analyze My Timeslip

Dumb question. How does a 67 dart weigh even remotely close to 3800 pounds.? It appears to not have a cage/ rollbar?
Reason i ask, my all steel 69 Dart with rollbar, Full carpeted interior, etc, etc missing only the back seat, weighs 3310 with a full tank of fuel and my 320 pound butt in it...lol