What should I do if the convertible enters winter storage?
Always keep the hood fully closed, this keeps the hood in shape. If it is a closed garage, it is best to place a simple, breathable dust cover over it. And it is not wrong even then the cover once a month or something to pick up. Humidity is (besides Stanley knives in the Randstad) the greatest enemy of (textile) convertible tops. Never cover with a waterproof cover, this causes mold.
Can I open the hood in the winter?
If the car is in an unheated area: Just let it rest. After all, it hibernates. Better not to open the hood. In the cold, the hood is very fragile, plastic windows break very easily, even when it is not even freezing. Even some glass windows are a bit scary in the winter because the window guide does not work optimally due to the cold and the window may 'skew', scare and break.