As an addendum regarding rust prone areas check under the battery tray. New, the car had a vent tube leading from the battery to the inside fender well for the escape of fumes. Time and battery replacements usually resulted in either the deterioration of the tube or failure to replace them. This allowed the corrosive sulfuric acid fumes to collect and dissolve the metal beneath the battery.

Replace the battery with an AGM type to forestall the problem.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now