I'm incapable of reviewing this, only thankful that you've put up a time lapse of your work. I will toss out a thought:
From car's inception you work with dozens of perspective lines so that you can begin sketching the car. That's fine, but I'd be tempted to sketch out a car first so that I've got a rough idea of what it looks like - and tweak its shape to fit the perspective afterwards.
Did you have a rough idea of what the car shape was going to be like, or was it structured by your guidelines?