Here is a few pictures of the catch.
It is just a Tee bracket that was bent, and the end rounded, works perfect.
Use the existing door hinge bolts( for reversing door).
That's pretty much what I was thinking of, and will go on the list of things to do. "when all of the REALLY important things are done" . Looooong list. I'm told that a working shower is on the top of the REALLY important stuff.
Unfortunately there is something I have to do, before something I have to do,before something I have to do, before I do that.