Quite the patience you have there ! This seems to not be uncommon: manufacturers oozing professionalism, only to be kept waiting endlessly. I'm guessing it's agressive planning that's the cause usually, with high-volume high-profit customers/projects being given priority with small case projects dangling at the back, waiting for a machine to become available for a while. Along with the lack of correct and professional planning going on, projects like these get pushed out to the side and end up forgotten in the huge mess of deadlines.
I'm hoping you'll land on your feet, this is an interesting case with very nice ideas ! Loving the prototype !