For the wings, look at how auto windshields are transported by the installers. Simple to copy (and make adjustments) using PVC.
For fuselages, think along the lines of lumberyard racks for wood. Though if you don't have a topper you will be limited on how high you can safely stack them before you encounter wind blast.
With both you can use some soft nylon cord/rope to hold in place.
Just some food-4-thought.