The Europa shelters in a heated garage. Along with all you mentioned, exposing fibreglass to freeze/thaw cycles is not a good idea.
60/40 antifreeze/water mix is pretty much standard up here. Gives protection down to -40 and it really only gels at that point so it's still fine even lower with a careful warm up. Washer fluid is also rated down to -35 and lower. We use winter washer fluid year round so you don't have to drain it come the cold. Oils need to be thin and preferably synthetic. Conventional gear oils at -40 are essentially a soft solid.
Tires, at REALLY cold temperatures, do take a few hundred feet/meters to lose the frozen flat spot but less to do with water inside than cold, stiff sidewalls. Modern radials are much better in this regard.
My main vehicle lives outdoors and is not plugged in. It's an '04 Land Rover Disco 2 with two Webasto heaters. One warms the coolant and the other the interior. Down to -20, I hit the remote and, 20 minutes later, the interior is warm and the engine starts like a hot start in summer with instant warm air from the heater. By -40, again after 20 minutes, the interior is just above freezing and the engine starts -- which it sure wouldn't otherwise.
It all sounds pretty dire but it isn't really. At these temps there is virtually zero moisture in the air so it feels no where near as cold as it sounds. Still you always have to dress as though the car might break down, or get stuck, and cary the appropriate gear for recovery and survival.
