Hey Bengie it sounds to me like this one is n-i-c-e !

What does the paint look like exactly as far as condition ?

Judging from the descriptions of lack of corrosion (no corrosion as in shiny and mirror-like inside the wings ?) Then it sounds to me like the paint will be in pretty good shape. I think there is a definite difference between solid paint that has chips and shows wear from use and is a crud and corrosion free airframe versus paint that is worn from being out in the elements too much and is cruddy and crispy with corrosion. In the former case, the luster is easy to bring out to a high gloss shine and there is nothing that a solid and consistent coat of wax will not take care of for keeping any exposed metal nice and protected. Are you able to keep her stabled inside somewhere ?

Is that crack in the lower panel one that runs from the carb heat knob over into the little slot for the trim tab ? Mine has that and one dealer I talked to said it is a common place for the plastic to fail in 150s/152s

As far as the all original interior and exterior - I can totally appreciate that as a huge plus.

Also, if there is no damage history in the logs or in the FAA databases and there are no anomalies found in the airframe then I'd feel like it was ok.

A bunch of what you've described is kind of how my bird was when I bought it and exactly what I was looking for too.

I was mostly concerned about an original paint/interior with relatively low hours and I had to have the shiny aluminium inside the airframe. . . of course I ended up spending a mint on mechanical stuff to get it up to snuff so that is the part I regret, but now that it is all up to code, I'm ok with it. Too bad I don't have any money left for a pair of the HID lighted wingtips