AW, I used to keep my planes in an unheated garage in Michigan. As you mentioned the temperature fluctuations created a lot of condensation on any metal. These conditions never created a problem for my planes. For the engines I always lube them up real good at the end of the flying season and don't touch them until the spring. However I like your idea of turning them over periodically… can’t hurt.

For fuselage storage I’ve used all the different methods in the past 20+ years. As for hanging them vertically or horizontal… In my opinion one doesn’t suit the airframe better than the other. The method of storage for me has always been directed by size of the plane and the space available, with an emphasis on keeping it out of harms way and not getting hangar rash. For wings I don’t like the idea of standing them there its tips. Too much chance of falling over and getting damaged, I’ve always used the horizontal storage method.

One thing I always did when my planes were stored in that garage during the winter was remove the receivers and batteries and store them along with my TX’s in the house. Regardless of the storage conditions, planes and transmitters that are to be stored for a long period should have the batteries disconnected.

Hope this helps.