Custom textures on official models?

I'm currently using the Rocket model from the red team on my map, but I want to change the texture it is using. Not only this, but, if possible, enlarge the resolution.

I was wondering if this is possible, and if so, how?

Looking forward to any responses, thanks in advance!

-Syzzle

That's the word, reskin. I should've searched for that, my apologies.

Thanks for the link though, will definitely come in handy.

I'm really curious if someone knows how I can increase the resolution as well.

Thanks for the input so far!

e: Didn't saw yyler's post yet, but shouldn't doubling it just mess up the texture? I imagine (though I'm clueless), that the engine model looks at texture files with coordinates? So when you increase the coordinates get messed up?

Also, I assume I would need to create a custom texture from scratch..