Yes, I do realise that its a 'tin can', that's why I asked about insulation and ventilation. Obviously, windows and doors will have to be put in. But what about ventilation shafts? if so, where and how? I live in Ireland, we have very wet winters, sometimes a week of almost nonstop rain, followed by several more like that....and it can get to minus 5 C to 10 C on rare occasions, but average winter temperatures minus 3 C to plus 7 C, with strong winds making temperatures feel lower, so good heating is very important in winter. Summers can peak 25C to 28C during day times, but would average about 15C to 20C, with colder nights, and still a fair bit of rain....Can you explain about suggested heat exchange/air circulation unit?
I did live in a small caravan for 3 years, and had a tiny wood burning stove which kept the place very snug, and didn't have bad condensation at all