NeilBlanchard -- Well maybe. The wind tunnel picture looks like it might have a slider like a Type II. But in the other pictures they look to be one piece. They definitely don't roll down. Unless the alligator open on that curved back edge, I can't see it.
I'd sooner believe that nostril under the center of the windshield opens.
chillsworld -- Grant-53 covered the steering, sand rail parts could provide the hydraulic clutch.
What a Baja'd streamliner might look like:
