Spacefiddle here are some things I came across when modifying this mod on my side in FCS:
Missing Material Police under Plate Jacket (this was mentioned in the discussion)
Under Items > Material Assassin1 darker the texture path is to another mod and needs to be changed to this mods path.
Recommend to lower the specular multi on the following materials sfiddle_color samurai armor, barbarian heavy, and drifter-heartplate

However, even without these changes the mod is great, and I thank you for all your work!