Looking over traits for my Minion, and I notice Natural armours rules.

"This trait does not stack with armour. This armour stacks with armour worn, but not with the machine trait."

So what do you folks reckon? One member in my group is to the opinion Natural Armour isn't supposed to be used with armour as natural armour is supposed to represent chiten hides and the like, which armour would be awkward to where over, while I more so believe its more intended that a character/minion can benefit from Natural armour + armour or machine + armour but not all three.

Machine and armor are not mutually exclusive and stack with each other. Natural armor is mutually exclusive with everything, and doesn't stack with anything.

Like your player said, natural armor is supposed to represent chitin or scales or heavy fur or something like that. Now, you could argue that it would be easy to throw a flak vest on Ted the Chaos Dog, but why would you? It doesn't really make much sense.

That is my take on it.

lol, nice catch. Reminds me of the old paradox: "The following statement is true. The preceding statement is false."

I'd go with the second sentence. Natural armor does, indeed, represent tough hides and chitin. Then again, http://www.forgeworld.co.uk/Warhammer-40000/GARGANTUAN-SQUIGGOTH.html kinda makes a point about armoring over natural armor.

In my opinion, natural armor stacks with worn armor but not the machine trait. It makes sense, 'cause if you bolt tank plates on chitin, it will take more damage. Now, getting armor that fits over natural armor, especially the kind found on anything but chaos followers who luck into some mutations... that's a bit more of a challenge.