How do I get submesh UVs onto a model?

[LogWhat1]

I'm using ulteq's blender N/B importer. When you import a N/B, sadly it doesn't contain the submesh UVs. I tried following texcoords but it results in this:

and I don't think that looks right.
I also manually added the UVs based on in-game UVs. It's tedious, and it makes the vehicle look correct, but I don't think it's correct.

 

[LogWhat1]

I did it with texcoords! I had to separate each part that had its section separated. The number of the nodes change each seperation, so I had to use another import of the truck in another file. (Not sure why the underbody parts are red..?)