Just finished this today!
Darn it, I selected the Countach because I thought it's simple wedgy shape would be a nice simple exercise for me. I should have known I was wrong when it took me about 2 hours just to finish drawing the lines, then what I expected to be a few hours' worth of painting took nearly 20 hours to complete!! I underestimated the complexity of the Countach's design! Well, anyway, glad it's complete now, at long last, woohooo! Please view the full-size version here!!!