Today I picked up the windshield, and the full wiper system, and the vent bezel!
Here they are just sitting in the approximate position:
The windshield is a bit narrower at the top than I had anticipated, but that is a good thing, I think. Remember, the chassis was based on a 3D model of the Smart ForTwo that I got off the Internet, and while it was proportionally accurate and very detailed - it was scaled quite large, so I had to try and base the adjustment on the wheelbase of the car.
I am relieved that it looks like it will work. Very relieved.