How do I build a Murphy Bed that folds down from long side?

I currently have a futon in my den that folds out into a full-sized bed. I am thinking I might like a murphy bed that will take up the same floor space when down, but could have a craft or sewing table that comes down from underneath the Murphy bed when bed is not in use. Because of the way the room is configured, the bed would have to come down from the long side. I have only seen them coming down from the short side with the head of the bed against the wall. I would need the head of the bed at the side. Any suggestions on how to do this?