Be aware that enclosed spaces in the winter can tend to sweat and can form condensation on your outside surfaces. If I were to winter on the boat I'd want to make sure that I kept track of huimidity levels and probably used a dehumidifier as needed to prevent mold problems from developing. With a woody, this might want some watching.
I know from an RV manual I had, they cautioned about entended winter usage. I also had a tight house near Lake Superior many years ago which developed condensation in the attic space due to lack of ventilation and had a related mold problem.
Learning something new every day and enjoying every Sandwich ))