Hey Ken,
As I recall, Barclay James Harvest resolved the problem of getting a Mark II down a flight of stairs by just shoving it. Quick, effective and easy on the back.
Oh, by the way the way, your idea has equal merit.
Frank Stickle
PS. I have a walk-out basement and a climate controlled music room. I can get my Hammond A -100 and all my little 400s in and out without a problem. Jim is always welcome to store his machine at my place and I'll play whatever he want's me to over the phone.