I'm not sure why I second guessed every single thing on this car compared to every other car I've had... must be the fact that I've wanted a Porsche my whole life and I was petrofied that little things were going to be incredibly expensive to repair or I'd mess up the car if I didn't jump on everything I noticed about it after purchase.
I'm sure your engineering degree is handy with lots of work things as well as car issues... keep it!