I set the files up for you to just drop into the PK above the dedicated texture files for each variant. You won't need to do a lot of extra work, just re-save your texture sheets with the added layers ticked. The bump and spec files are a drop in to the texture.shared folder.
The rivet, panel and panel stress layers in the PK will highlight your skins with the added detail. I did a test run on one of your files already....nice!
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