If you think it good value to buy cosmetics, go for it. There was certainly some care put into the paint job.
But, if they are so mechanically inept that they can't fix or can't be bothered to fix a leaking carburetor, you can expect to find a lot of mechanical things it still needs.
IMO, they as just trying to cash in on a "craze". Remove a bunch of parts (and utility) off an otherwise good bike, throw pretty paint on it and flip it to the first drooling sucker that comes along. If they've already dropped the price 1K, they know these suckers aren't as plentiful as they thought, and they are trying to unload the mechanical repair burden onto someone else as quickly as possible.
FYI a black engine could simply be painted for effect, or it's had an F model transplant, the one with the troublesome valve guides.
Of course, people buy pretty things all the time. But, if it has no speedometer, mirror, or horn, it's only good for display, rather than street (hope it never rains or snows where you live, if so you'll have a one month in a year operation machine). Nice bit of garage conversation piece, I suppose. The local cafe crowd will be glad you joined them. But, if they aren't actually racing them, then you'll just become included into a superficial crowd where style dominates function (with rare exceptions).
I might ask what he wants for the tank and side covers, though. They do look nice. (I'd look for rust inside the tank first.) Seat might be ok if you ride less than 20 minutes a day. Or only use the bike for a picture subject.
Those are my thoughts!
Good luck!