Melting?
The doors, quarter panels, and bumpers are plastic. The roof, trunk and hood are all metal, which accounts for the lack of melting there. The bumpers are different plastic than the side panels, too.
And as for the lack of metal inside the doors, aside from the intrusion beams and X shaped metal beams across, there's nothing else in there. You can see the X of the metal bars in the picture if you look closely.
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