Re: Mini - not really
This was also done by the students at University College, London, about the same time. Engineering department students rigged a sheerlegs on the roof of the Engineering Building during the day, when it was not unusual for students to be up there, and one night they pushed the Austin Seven (about 1928 vintage, I think) up to the blank end wall of the building, hooked the hoist onto its front axle, and winched it up onto the roof. It was then manhandled across the roofs of that and other buildings until it was left perched crossways above the main entrance portico. College authorities had to employ the army and a huge crane to lift it down as they never found out who put it up there.
Many years later, at a College of Engineering in the Midlands where I was studying, one of our classmates woke up one morning to find his beloved Beetle perched on four (empty) beer barrels outside the Principal's Office.