Just to confirm the livery, I'd click on the f5adv.yft or f5adv_hi.yft file to open the OpenIV Model Viewer to see what the model will look like with the new livery.
Once satisfied, close the model viewer and run GTAV and spawn f5adv with the trainer of your choice.
Each of the .ytd files in the folders has the named livery as f5adv_texture within the .ytd file. I wasn't able to figure out how to add livery support to a model that doesn't have it already. Each .ytd file has all the liveries present, if you rename the current f5adv_texture to something else, then rename the f5adv_texture_sign_x to f5adv_texture, that will change the presented paint scheme.
If anyone can figure out how to add livery support, you've got my permission to use my f5adv_texture files.
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