Here are a couple of space-fillers for the 2013 Smart electric drive.
Thanks for building this list for the community.
Andy
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Source: http://www.smartusa.com/models/electric-drive/overview.aspx
Features and Specifications pop-up; Technical Specifications
Front Headroom: 39.7 inches
Rear Headroom: N/A
Front Legroom: 41.2 inches
Rear Legroom: N/A
Front Shoulder Room: 48 inches
Rear Shoulder Room: N/A
Front Hip Room: 45.4 inches
Rear Hip Room: You guessed it - N/A

Curb Weight: 2094 lbs (US model)
Charger kW: 3.3
Quick Charge: N/A
Motor Power: 47 cont; 74 peak (wide-open throttle 'kick down' switch)