Xbox One hardware inside original Xbox controller?
I haven't attempted this so I can't provide you with specific instructions but swapping the shells doesn't seem like too difficult of a task. You may have to do some cutting/gluing but overall I think it could work. As for the thumbsticks, I have no idea how that would work. You should contact a controller shop and ask somebody who works daily with Xbox controllers, they'd know a hell of a lot more than I would.
>He wants to pay someone for a task any middle school child should be able to accomplish
I can't remember who, but someone swapped the internals into the Duke and had them as a CE tourney prize or something. Very easy, assuming you can work a soldering iron and a few screw drivers.