Ok let me rephrase things slightly. I can fully appreciate there will be 'hidden' work making things fit, and that work would be technical and quite time consuming, I don't doubt that. Now I don't know if the bike is finished as it is seen here, or if there is more work to be done. My opinion/assumption is that it is unfinished (I fully accept its an assumption and could well be wrong). Perhaps the owner is more than happy with it as it stands, in which case good for him and may he have many happy trouble free miles riding ahead.
In my view, the whole thing would look better if the frame is stripped like the swingarm, and the tank is painted to match with the bodywork. Again that is only my view and in the greater scheme of things doesn't matter a jot. I'm not having a dig at the workmanship that's been carried out but at the moment to me at least, it looks mismatched.