7 years ago, I needed to store about 250 1/72 and 1/48 models. They have been safe since then, with no lost parts or damage. When people hear about my basement storage method they laugh at first, but when they see it they usually are surprised at how well it works. I wrap them individually in Saran wrap, tie a piece of cord around the tail, tie them in groups hanging from clothes hangers, and hang the hangers from nails in the floor joists above.
Details:
Take a piece (or two or three) of Saran wrap, set the model on it on its wheels, and then fold it up over the nose. Sort of like the plane taxied into the wrap. Then take some string, heavy enough to trust with the weight, and tie it around the rear fuselage. This will trap the Saran wrap, forming a bag to catch parts that may come loose, and repel dust. The string actually supports the weight of the model, so the wrap doesn't break small parts at the front of the plane. You now have a model in a bag, that can hang nose down. Tie several of them to a sturdy wire coathanger, and the coathanger can then be hung on a nail from above. I tie a small safety cord from nail to hanger IN CASE someone did bump them, but that hasn't happened yet. You can get 30 or 40 (or more) 1/72 scale on a hanger, and all that Saran wrap cushions them, if you are a little careful initially hanging them.
I know it seems a strange method, but it works well if you have a couple of out of the way corners in your basement. I couple of mine hang directly over a chest freezer! Its also relatively inexpensive.