It's kind of shocking how tied up to a specific roofline profile Tesla is, in order to meet range/price expectations. They'll likely never be able to put out an estate car without sacrifising range or making it obscenely expensive.
Also, wtf is up with everyone comparing the model 3 to A4/c-class/3-series? Current best estimates I can find put the model 3 at 5-10 inches shorter than either of those, and with a smaller interior (obvious just from looking at pictures, the model 3 interior roof profile is a lot less "square" than ze Germans, again for aero reasons). I think Mazda 3, but with a smaller trunk, is a better comparison. (Yes, I know the model 3 has a "frunk" to compensate.) I also think Tesla are being deliberately secretive with the external dimensions, to keep people thinking it's bigger than it actually is.
[1] http://i.kinja-img.com/gawker-media/image/upload/s--uaROKJL5...