Well they could, but this is the new way of doing business. Instead of putting people in a room and paying them to do the development work; you put up a prize for people to compete [among themselves] for and then build the winner. Seriously— it's a business model, like the X-Prize.
Here are the also rans:
and here is a 1/16th scale print of the body
And a 3-view drawing
That streetlight on the driver's head is part of the original design template. I think it was intended as a helmet with heads-up display.