Beautiful looking paint and body work. Extensive chassis and engine detailing. With the interior this really looks like what you would see at a custom car show.
The wrap around rear window was always fascinating to me. Like the realistic ride height and tires. This would be driven over some rough terrain and pavement would be optional.
Great work on the headlights. This had become a problem through the years as the tool for the grill was changed from time to time. As for tools to work with you may want to find a smaller pin vise as well. You will quickly find out just how handy they can be.
Kits of all of the race cars in the movie were produced just one time to the best of my memory. They were all based on the Chevy Lumina body and those kits are around. Finding the originals may be a challenge.
I use one of the smaller open spray booths and haven't had any dust issues. My thought is that it may have more to do with the environment of the area where your spray booth is set up. An area with a lot of dust setting on shelves or work benches not to mention the spray booth itself if left on covered in a dust area could lead to dust in your paint work. Static electricity can also leave a plastic model that attracts dust in the air.
Kit is from the much earlier times of modeling. The correct basic shapes are all there. With a detail painted chassis, filling the engine hole, and creating some front wheel spindles this will build into a very nice-looking model.
Looking at the K cross member, on the driver's side facing the rear of the car, a part looking very much like a brake booster with a pultrusion to the rear looks very close to a brake master cylinder. Could this be what you're looking for?