When I moved, half way across the country, I packed em with packing foam (sponge-like stuff). I used them to craddle the models.
I cut the "craddles" to fit snug on the fuse. sometimes you'll have to put a foam block under each wing on bigger model, or a block at either end, just to keep things from shifting.
I used pretty big boxes, with multiple "shelves". I placed the bottom layer of models in, and used hard styrofoam "pillars" to hold up a sheet of cardboard for the next layer. some boxes had as many as five layers. Out of 113 models moved, I only had to reglue one popped off canopy, 2 fuel tanks, and 1 landing gear......pretty dang good!
These two are on a second shelf, going to a contest.
I haven't been able to find this foam anywhere, since my supply ran out, but I did pick up some foam padding from a fabric store, that is about the same and works just as good. It comes in a roll (it's green) and is about 1" thick. A 2' x 2' piece oughtta do a good 70-80 models.
I used Elmers glue to hold the foam.