Jordan, the only thing I see wrong with your latch drawing.....the "tongue" that tapers down to 3/4 wide and 1/4 thick at the end with the hole in it, actually tapers down from the hinge to the end as opposed to being 1/4 inch all the way from hinge to end. If there is no taper it may not fit into the slot that it mates with.Looks pretty good otherwise.
I can go out and measure the thickness at the end tonite after work.