75 Dart - as thin bodied as they say?

Thanks for that guys - I was hoping this was the case... I'm definitely familiar with GM cutting corners and having design flaws that cause rust. Unfortunately, my daily driver Ram has a similar design flaw that allows mud and water to get trapped under the rear fender lip... both sides started rusting this spring.

However... the Dart I'm looking at appears solid in all the telltale spots I can see - I haven't had a chance to crawl underneath her yet.