Crazy! As mentioned above, it appears to be a very thorough job, but the cost of the mods and the insurance premium for all the mods must make it a bit silly?
Not only that, could you imagine how it feels when a real R arrives next to you at the lights? You'd feel like an utter idiot and want to sink into a hole.
Maybe he's selling it because he's realised that a real R isn't out of the question and he's ordered one!