'Twas tempted to close this as it is very similar to all of the other transport threads we have but as it is just about storing I'll let it go on...
First of all, experience has led me to say never store your skimmers with the bases on as it will wear out the joint or worse case scenario, cause it to snap.
I store my vehicles vertically with a deep enough tray to accommodate poles and sails (however I do magnetise my sails).
Also most importantly, no matter how well you pad your Dark Eldar, how perfectly you place them in a case, they will break and snap and cause you to lose every sense of justice with the world.
_________________
Sky Serpent - Drukhari 40k
My Facebook blog, follow for battle reports, tactics, painting and conversions