Bob's Duesenberg is absolutely mind-blowing. The level of detail he achieved is amazing, and since I'm a big fan of brass era and classic cars, putting this one on the cover was a real treat for me.
That one was very easy... sort of Auto Shop 101. I got 'em all...
PS: Bill... I edited your post. You shouldn't post hints here, it ruins it for others who want to take the quiz.