It looks like a nice car and could either be an opportunity or disaster.
I would go and see the car. Take a torch, spend at least an hour, look at the areas that are hard to mask off and paint, like bottoms of doors, front inner wings (inside the bonnet) around the window rubbers, inside the boot. Make sure you have perfect daylight. Take pictures. If the body looks legit, then study the mechanics, start it up, cold hopefully, and drive it. Does it make funny sounds or pull? what about under braking? Gearchanges sound smooth? How does the oil look? Black and stinky? Wet drips under engine or box? (look where its been parked).
In my experience (or maybe because of it?) by this time a car either will or will not feel like being worth making an offer on. If it feels right, make a conditional offer pending a full inspection. Make the offer as low as the market justifies (do your research beforehand). If they accept that offer, and something shows up, you can legitimately show the costs of the pending items and reduce your offer price accordingly.
Sorry of all the above is obvious! Just sharing how I do this. Good luck!