Very interesting, Frederik:
How are the inside cavities (and cabin) going to be treated, just with preservative oils of some sort? I guess I would recommend installing a little air dehumidifier which can be run from time to time (and with small fans transporting dry air to all rooms). That keeps mildew, rot and even rust away. Some of the metal things in the cabin of my Ingeborg are just (electro-) galvanized, but there are still no sign of rust after six years. I generally keep the RH below 70%.
Keep up the good work,
Arne