The question has got to be is it reversible? I think the refin colour is marvellous, but I hate the top horn. It's clearly been well done, but without knowing what is under that finish, you are taking a real risk with this one. I like the way they treated the serial number - better than just loosing it.
Mind you, the parts alone could be worth a significant amount, so I guess it depends on how much they want for it.