Robot Limb re"shape"

[OF-3 Flaw]

Hey guys,

I thought about adding robot limbs, but making them look like limbs from different races. I thought it would just be a matter of copying already existing robot limbs and swapping out some meshes and skins. But!... I'm almost a complete noob when it comes to modding.
Does someone care to explain how it would work?
Meshes are the shape of things and textures the skin that gets "pulled over" it, right?
So the problem is that there's no mesh nor texture for just a single limb of a certain race, right?

Feel free to adopt that idea, but share your results ^-^''