I don't know about the car.
It appears the 'boiler' has never been fired, or fitted with a shell. Just as clearly, the front downtubes were routed forward and down to clear the boiler assembly. I'm guessing a modest water tank would fit behind the seat, between the cylinders. Or maybe that would be the fuel tank, and a water tank would fit where a normal motorcycle fuel tank goes.
The bike is resting on blocks where a centerstand would be, and the rear wheel is slightly off the ground for what is clearly an engine test with an external steam supply. I think I see 'motion blur' on the rear wheel spokes and a little exhaust steam behind the rear wheel, suggesting that the first two pictures (duplicates?) were taken with the engine running.
Mike Halloran
Pembroke Pines, FL, USA