Car looks like a good one that has been really well looked after. And the price is spot on. The stress cracks he talks about are very common. They show themselves at the base of the windscreen/top of the wing corners. However if you do go to see it insist on lifting the carpet and checking the base of the front door line (were it bends round to the sill) to check for cracks there. If there are the cars had a hard life. But I don't think you'll find any on this car. I agree with him to that Alcantara seats are much nicer than leather. Again though ask about the drivers bolster as these wear through easily. The 16" wheels are Evo 2 wheels and make the car look just right in my eyes.
I would have just one reservation, Which you can only judge by driving the car. I'm not a fan of the Koni dampers as I find them hard even on their softest settings, so I've no idea what the ride would be like with Koni springs to. My Evo has Konis and is brick hard and one of the other Grale's I had had the Koni dampers and found it a very hard ride to. Most people go for FE (Finale addition) springs along with either standard dampers (which can be hard to get at times) but to me make a perfect compromise for everyday use, or use Leda Dampers which are expensive but good.
Rust areas to watch for are the rear of the roof edge and the base of the windscreen, and I see he's pointed out these are spot on.
Electrically some of the sensors for the engine can go funny which can take a little while to trace back and are usually a bad earth. Like our ferrari's the window motors can be slow and the indicator stalks can break easy. Oh and the dearest thing to buy for the car is headlights. Check those. They are very, very hard to get now and I've seen them advertised up to £1000 a set. People have resorted to adopting MK1 polo ones to fit as they are the same size.
Mechanically as long as the belts are done when they should be the engine should never give trouble. watch for take up klunks from the drive train indicating signs of wear when you go to take off. If the front steering feels a little loose cornering it could be nothing more than the car needs new drop links which go on a regular basis and only cost about £50 to replace. New ones make a great difference though.
The other thing is depending how you view it, some people in the integrale world don't like Zagato as they think they are very dear to buy from, so he's spent money on the car.
I see to he says he's going to put it on the Evo forum. If you use their forum for advice be prepared for, How can I put this politely, a lot of intolerance. they are not like the very helpful and friendly people on here. Ask what you think is a sensible question because your not up to speed on integrale's and you may receive a response you didn't expect. It can put people off. And always make sure you use a small i to spell integrale or they will lambast you for it. They are a close nit bunch and hard to get in with.
I think that covers most of it but if you can think of anything else your not sure of just ask. I don't know everything but I'll help were I can.