Tweaked the shading parameters some more, trading diffuse coloring for more specularity mainly for metals. Plus added a slightly altered normal map which in theory has true normality. Fixed an UV artifact/error from the very original HL:A model.

Also fixed hitboxes as I never noticed they were not into the QCs until now.

One day I'll think of redoing the imagery for more accuracy on what to expect.
xd

Tweaked Base textures' tint mask.

Tweaked around the Metalness+AO mask over the Base Texture. Good news means that if you want to recreate this in another model you will not need any tedious tweaking and calculations.

Such masking is still up to taste.

Version 1: The finally decent content for people to use and be happy with.

Version 0: Testing plus getting everything sorted begins.