I am really looking forward to this thread, though I must say I hope I don't have to ever do this. When my engine drank water this past spring I was worried I would have to do this. And like Mark concluded, moving the engine block through the door would only be a last resort senario.
When working on my engine this spring I was suprised and happy with doing the work "inside the boat". Turn the heat on, radio, move the carpet and instant garage! And it was really easy to reach back to the fridge.

One nice thing obout the layout was the room to work in and around the engine.
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Watch that salon ladder though. Mine got loose not being always properly supported with the floor boards removed and had to be rebuilt, after it broke under me about busting my butt.
Good luck
Bill