If I were looking for a project car, I wouldn't consider the paint because it's likely that any car I looked at would need paint, but I would check out the body for damage. The frame is the most important thing to look at because if that needs repair or replacement, the project is exponentially bigger.
I suppose it's possible that the roll bar links were bent from hitting a speed bump but it must have been a steep one and he must have been going pretty fast. That would make me look for other damage in the area. In fact, I might assume some things about the way he drives and be more diligent looking for other bent pieces.
Something else to consider is if the PO (and how many POs are there?) did any modifications. Some people have a vaunted opinion of their skills and end up making things worse. I would be careful about anything that isn't easily reversible (said the guy is not shy about changing just about everything on his car!). From what I can tell, that isn't a problem on this car.
I don't consider that I have any aptitude in pricing "discarded" Europas and I would only consider the cost of repairs if I were going to sell it or I have a budget. If I were interested in selling it, I'd keep it as stock as possible and concentrate on making it the best Europa (like this one:
https://bringatrailer.com/listing/1973-lotus-europa-special-3/). Expect to spend more than you expected. For that reason I think it makes more sense to spend it on yourself.
After ten years outside, I would expect an engine rebuild would be in the cards. I think you would be really lucky to get away with just rebuilding the carbs. I can easily be wrong and I hope I am. The same goes for the tranny.
And then only you know if you are susceptible to mission creep. For some, it takes a lot of discipline to do what needs to be done and not take use every instance where you take a part off the car that needs to be taken off to take another part off that doesn't to make it a little prettier or "better".
I hope that helps a little.