You have 2 ways of doing this:
1.
You can import the 3d files with UABE, but you will have to edit the ATLAS_motorparts.tex in order to get a working texture on your model.
Extract the ATLAS_motorparts.tex using UAE and open the dds file you get.
When you open the dds file, somewhere on the image is the subwoofer displayed and you’ll have to edit this part of the image.
2.
If you’re a modder, you can do it with Unity Editor and Visual Studio.
Open the obj file in Unity Editor and make an AssetBundle (with texture, mesh renderer and mesh colliders ofcourse).
Make your modscript in Visual Studio and import your mod files into the mods folder for modloader (after debugging your mod, but I shouldn’t have to say it).
If you’ve done it right, you should have a working mod!