This is a fun mystery! Posted to the front page.
I'm sure I'm not the only one questioning the design behind the rear wheels, and would love to know more about the builder's thinking there.
The front & greenhouse looks great, but that "reverse slope" behind the rear wheels raises a red flag as far as conventional low-drag shapes go.
And the soot on the back? Doesn't look like a "Clean Diesel (TM)".