Opens canopy style.
I was thinking an upside down plow foot to act as a peg, so it sits in the loop and keeps the door from raising. Also would have a hole in the bottom for a lock, unfortunately I don't think one is tall enough, and probably can't ft much of a lock.
Hole diameter is approx 3/4". I'm ditching the gate style latch you see there and trying to utilize the welded loops.