Well,... Speaking as someone that is going through that part of the process, I agree with what Chargervert said. I replaced many of the same components mentioned in the ad with new AMD components. If I remember correctly off the top of my head, all my AMD components added up to around $5k - $6k. Add in the labor to install all those components and get the prime, fill and blocking done and as Chargervert said...... He's not far off on the price.
I am learning quickly the costs associated with doing all that metal work and prep for paint. It is BY FAR the most expensive part of the process. Now,... that being said, it is impossible to tell the quality of the work done, but if he paid someone to do it, and they did it right, you could EASILY have that much just into bringing the body back to perfect condition. Ask me how I know!!