Eighty four inches is way too wide - driving into an 8' wide garage door would only have 6" per side for clearance.
If you want wide, the make the out-to-out dimension 68"-72".
The leading edges on the wheel fairings don't need to extend as far ahead of the wheels. And the overall vehicle length is probably longer than it needs to be; in the front in particular. The driver's head is right about the halfway point, which means the nose is about 6'-4" in front of the driver's eyes. That's a long way.
Smaller = lighter. You mention a required bumper - front and back?
This earlier revision is much better in all the areas I mentioned:
I like your modeling program - it is SolidWorks or something else?