Before I added the roof and glass parts I test fitted this assembly over the chassis/interior. It fell into place easily (and was a lot harder to remove than install).
I used the LP Smoke paint for the top glass pieces. It says not to cement these clear parts in, and can be assembled without any, but I used a few tiny drops of canopy glue at the locating tabs just to keep them in place until the center section was installed to lock them to the car.
[img]https://i.imgur.com/b39ravu.jpg[/img]