simple box hinge straight or bend - OpenScad

I know, I know - there are many parametric hinges but I tried to design one myself.
On board of ships we have many boxes outside for automatic start/stops of pumps, control panels of winches etc. Usually made from thin steel plate with simple hinges. As You know, steel got rust very quickly at sea. Most vulnerable are hinges, which often broke.
So I tried to design simple replacement with ability to bend 90 degree to be screwed on the top of the cover.
Hope that will work - it is not printed yet - no 3d printer on board.