Hello,
This is my second attempt to model a car without any blueprints. Rendered with Cycles. I couldn’t find good node setup for glass in windows and had some problems with topology. Results below. Please feel free to criticise 
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Why?
why second? i created one before.
why without blueprints? to design a car not only reproduce existing one
why in general? because 
Hey thats a good job, but working whiout any guideline can be a bad thing for you. I suggest you to design the car beforehand and then make it in 3D. As for a good glass shadder, try this:
U sure it’s the way to design a car?
More than 200 years of automotive have passed now, but designers/engineers still start with pen and paper (more or less).
Windows with Kendarr node setup:
Glass shader bend light too much. Previously i used refracion and transparent shader with fresnel as mix factor.
The fresnel came with PBR shadder from Blender Guru its an old video from Andrew