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I read an article in the WSJ saying the Model 3 will be steel based instead of Al based like its bigger siblings. Heavier vehicle..

* Article title is "A Lot Riding on Tesla's Model 3 Unveiling"

It's a mix of steel and aluminium (source: Tesla employee in their Periscope Test Drive: https://www.periscope.tv/TeslaMotors/1dRKZyRkpgNxB )