Sounds like a great time........... Down here we've had some cooler weather as well and I love to drive just to hear the exhaust on the V8........
As for the rattles and the plastic....... I had a $67K BMW M3 and it was worse. The interior was crap. In fact I'd go so far as to tell you the leather in the Ford is better than what I got in the M3. Also on the Mustang, Ford was smart enough to place felt-like materials where the leather and plastics rub. It is not the same on the M3. As a result, I'd get squeaks in the car when driven b/c of the leather rubbing against the plastic. On the Mustang, for a little over 1/3 the price, I have a car that I can easily get similar power out of relatively cheap. What I'd like to do now (it just has 2K miles on it right now) is upgrade the suspension and upgrade the interior.
I had asked here and some other forums about upgraded panels like something wrapped in carbon fiber but was scoffed at. I have recently seen more aluminum is available. Perhaps it'll be a combination of leather upgrades and aluminum accents. We'll see.
Anyways......... enjoy........