Bill Tindall, E.Tn.
I have spared no effort in making the corner cupboard as complicated as possible so why rely on off the shelf hardware?
I think Krenov's engineering is underappreciated. While visiting the school I was shown the rub catch he used on doors to hold them closed. It took a few practice runs to recall how to build and install them. They go on the top of the door and a pin supports the closed door at the bottom. I think the pictures are self explanatory. They are rough "carved" with a band saw and refined with file. When done right they provide a smooth unobtrusive closure.
(the large brad point hole is not part of the catch function. Ignore it)