I'm thinking one good heavy wet snowfall should cave that baby right in on your favorite ride.
Perhaps a bit of preventative support might be in order here....say in the way of ridge support and some midway supports tied in at the gable ends??
Otherwise, and aside from the wimpy lock, probably keep the rain off and nosy neighbors from cracking the door open.
Man after my own heart...improvize and get something done...I like it.