I keep mine in the hard case, but don't find that it takes up any more room than a plastic handgun case. I store it in my reloading room on a shelf next to some ammo cans. The ammo cans take up more space. But, that's just me.
i got one of these for mine. pluck foam for a personalize fit. also plenty of room for the MKM mount. i'm sure there would be something available similar in other countries. if what i have is too big for some, you might look at a larger vehicle than a storage case for the magneto speed.