Hi, that is a good list. The only things I would suggest are;
Instead of salt, you could use cheap dehumidifier sachets - I use the ones with a hanger and put them on the rail in the wardrobe (they are usually less than £1 each).
Get a piece of water pipe insulation foam and cut it into small pieces; use these to hold cupboard, fridge/freezer and wardrobe doors slightly open, allowing better airflow. and they don't fall off if anyone opens the doors.
It is recommended to remove the shower thermostatic mixer because they can hold water and become damaged if it freezes. (This may not be necessaey if the heating system is on frost protect, with gas and electricity on).
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