Cars Problem with kn5

[GaryUK]

New Question:
I'm working on a car, having trouble creating a .kn5 that works properly in game. The .fbx loads into KS Editor fine, everything looks correct. I can save the .kn5, no errors. The .kn5 loads into Content Manager correctly, e.g. the showroom. Everything looks correct in the CM showroom. The issue is when I load the car in-game, the wheels and tyres are not visible. This could be a scale issue, that the wheels and tyres are "there," just incredibly small, e.g., 1/100 correct size? I don't know. The .fbx objects are all set at scale=1.0. The dimensions of the car objects in the .fbx are all 1/100 normal size, as I imported it into Blender with scale 0.01 (as instructed elsewhere) and then applied scale to all objects.
I've tried everything I can think of. The car itself is fine in-game, drives fine, looks great, except it has no wheels and tires.
In KS Editor

In AC CM

In AC game