Well, this is outside my expertise. I just measured it, if it were flat it would be about 5' 8" long, 13" wide and 1/4" thick. I don't have a scale but people have posted elsewhere they're around 40 pounds. It did feel a little heavy for aluminum. Maybe someone who knows materials can venture a guess.

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1982 240D automatic
Odometer quit at 307K...about 325K now