Each Spaceships campervan is different - they all have their own distinctive lay-out - so the storage space is different as well. They all come with lockable storage, not a locker, but storage space (Beta, Beta 2S and Beta 2S Self-Contained) or a special compartment (Dream Sleeper Mini) that can be locked.
Our Campervan Comparison Page shows all specifications & features of each campervan. It also shows you the dimensions of the storage space of each campervan category. By going to each vehicle's details page you'll see heaps of photos of each campervan. Both image galleries are scrollable/swipeable.
More info about the storage space, including photos.