They were kept outside in a row alongside the Cats and the IH. Servicing was usually done in the corridor, although cleaning the floor afterwards was a pain
They were never ridden up the stairs, they were lifted with the crane. Well, aslong as it wasn't too windy they were! They did however get ridden down the steps.
Yes one did go off the platform, the cable had jammed and it shot off the platform. Quite a mess
Although looking at the date of your post, I doubt you'll care much now.