But you don't need reference, that's the beauty. You make stuff up and then open yourself up for humiliation or glory and then try again
Ahh CG-Cars, seems like a nice place to lurk.
When I want to get critique on a design or make some changes of the design I tend not to post much on CG oriented forums. It's not because the people are blind or stupid, but because they normally pay too much attention to the model, how it was modeled, with what it was modeled, small modeling errors etc.
I get comments sometimes that say to abandon Sketchup and try something else. I know they mean well and they may be right but I just want to make cool designs not to be a perfect modeler

Although sometimes I wish I had also learnt maya or 3dsmax. I lost a job opportunity because of that.. oh well.
So that's why I mainly use Local Motors posting for my cars, most there are design oriented and will guide you in that sense, but if you want technical help for modeling or drawing there are people that are good at those too.
If you check my Sunbeam project on LM, you'll see how much the car and me evolved in the last 3 years. Sometimes I can't believe I really liked that first shitty blob
