Idk if it's just me not being that familiar with them, but it seems like those fairings might not be oem. It'd be worth checking out, you can replace that one fairing if they are oem. If not then your buying a whole new kit. As far as turn signals go, your gonna need to actually look at the bike and verify the wires are still there for you to attach to, if not then your going to be doing unexpected work. The tire, well that means he either likes to burn it down or he doesnt lean at allllll in a turn. as far as the chain and sprocket goes, you always replace them together so that they wear together, but thats only worth about 150 bucks for the cheap stuff which is what he will be putting on it. I cant imagine that bike being in good order, im sure he hasnt changed the oil, cleaned the carbs, changed the oil filter when it was supposed to be done. So up to you but I might pay 15-17 hundred for it.
The old people seem to be worse than the teens texting, I say once your 60: driving test every year.