My upper connection just broke today exactly as some of you have described. I'm exploring the warranty option but I'm really don't want to go without the Slung for however long it takes them to replace it. Thinking about repair options.
@Toobad4u, @jaycanter, I don't suppose you have any pictures of the final product to share?
Maybe someone who's installed the DDM tank will send you their stock tank? Check that thread and reach out! Great group of guys and gals here... Even heard about possible wife swapping!