True Combine AR2

A retouching of the AR2.

The idea was that, since all of the combine sources have a teal glow to them, and all their metal rusts like copper, that I'd make a skin which follows that pattern.

Thank you to Vertthrasher; your reskin was used as my starting point.

What I have done: -Added detail textures -Reworked the Ar2 core -Added new normal and spec maps