EJ333,
sure visible rust gives rise to concern w/ any e9. rust is like cancer in a human - its always there ... the question to answer is it terminal? and what stage it is in. and that is why i recommend looking at it in person - or taking it to a doctor for examination. you are only going to understand so much by looking at pics. we can all tear a car down without ever looking at it. what good does that do? when we see a car that has a lot going for it, we should encourage somebody to go look at it and report back or buy it if its a good value. that's the only way you are going to find a diamond in the rough, for the cost of a plane ticket ... or paying somebody local to do a reasonable examination. otherwise, pull out a serious bankroll and go buy a coupe from one of the restorers.
so we saw a couple of bubbles on one side - its a usual location ... but pull the wheel and look and feel all over the inside of the fender and firewall. look at the floor underneath and the rocker panel ends. if you see a lot more tin worms - you can walk away. but if you don't, look at the back of the firewall (in the gloveboxes) and perhaps pull the rocker cover. or lift the car slightly on one of the jackpoints and listen for the creaking.
so what if you don't find much ... look for coverup ... then look at the other places in detail.
if this was a perfect car, it wouldn't be 12.5k. my point is that it looks like a reasonable car that is already miles ahead of many cars we have seen advertized for more money.