Great job! I too am a weekend warrior detailing hobbyist. I have numerous friends and co-workers who don't take care of their daily drivers, so what you got isn't as uncommon as you might think. At best, tunnel car washes a couple of times a year is what these type of owners put their cars through.
IMO, knowing that your friend was going to sell the car, I would not have put as much effort into paint correction nor as many layers of protection. Even if your friend wasn't going to sell, I also wouldn't have put as much effort unless he starts taking proper care of the car. Sure, it's gratifying to see the results. It's just unfortunate the results won't last too long.
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Exactly what I was thinking. An AIO may have been sufficient.
A great job.