Where is the Weapons_skins.xtblYup you should already have the modding patch installed if your copy of SRIV is up to date.
You can either use 3d modelling software along with the SDK to apply a chrome material to the model or retexture the baseball bat to make it look more like metal.
I extracted patch_compressed.vpp_pc to folder and only have Weapons (This is Models) & Weapon_Costumes (Is this the Skins)