Just to add to this, garage doors, at least all the ones i've seen, are made of sheet metal and styrofoam. That's the kind that it looks like in the picture. so the hinges will likely rip out if pulled in the wrong direction.
some questions that I'm not looking for an answer to, but to think about.
How are you going to wrap a rope around the hinge, is there enough room for a rope? Can you tie multiple ropes together and make a web that connects to mutiple hinges? Is that a sturdy beam in the back holding up that red ice chest in the back? (Not hinting at anything, just curious *wink*)