Not a real wagon at all. Totally created in 3D. Photoshop only used at the end process for some color adjustment, according to the artist. (Seen in a post on the book of Face.....) I told the creator it needed FOUR racing seats. This race vehicle needs passengers. Heck, maybe put in a couple more in the back, facing rearwards.....
The rendering looks good, at a glance. Once it was revealed as a render, a close look showed me the cues.