Not good, not good at all. Why keep it outside ?? this is a piece of automotive history that should be pampered.... but on the other hand of course also driven regularly. Seems both the pampering and driving didn't happen to your GT. And you said it yourself; 250K in US$ is a lot of money, so one more reason to take good care of it.
Is the car even in driving condition ? I can imagine that prolonged periods of sub-zero and even -25 degrees temperatures can cause many types of damage to a vehicle like this.
This is certainly not a T-34 tank....