Highend3D, Maya's website has some... I personally have found that in my mechs to make as much of the texture in modeling itself then color it. In your case I'd say to make a bumpmapped one as well as modeled bumps! Check out my current WIP to see what I mean.
https://forums.simplymaya.com/showthr...5&pagenumber=1
L8
May the force be with you...always!
A Jedi shall not know anger nor hatred nor Love
The only way to live a good life is to act upon your emotions
A warrior is reborn when he has something to protect