Ok, well, so much for days/weeks:
The Yamato with the NBB_Yamato_T01.dds texture mapped using coordinates from the standard index array:
The Yamato again, this time textured with the RGB channel of NBB_Yamato_O01.dds. Note that I ONLY used the last TMAP texture index coordinates here, and completely ignored the standard texture index coordinate array.
See all the rust and deep shadows? TMAP solved... Well partially, now for interiors... Will look asap