I wouldn't do it. The guy did most everything right on it but it's the lower quarter bubbling that would have me walking away at 15k. People always use lines like "It's just got the usual rust on the lower quarters and around the rear window" as if it just takes a Saturday afternoon to fix all that.
If it's bubbling on the rear quarters then it's 99% more than likely rust. You just can't see it because it hasn't broke through the paint yet. If you went in for an Earl Schieb scuff and paint, it'll be back to bubbling in less than a year. If you go get a nice paint job on it, you'll be paying for patch panels to be put on.
For me, that drops the value of the car down tremendously. Also the dash pad change would be a pain in the ***. I'd also hate to pull those well done seat covers off but I'd have to because the 2 tone look is an eye sore to me.