In the Atari Jaguar community there was a fan who successfully contracted with a factory in China to recreate the ultra rare Atari Jaguar 6 button controller. The Chinese factory had to create new plastic molds for the case and buttons (very expensive) as well as recreating the PCB. He was successful, but just to give an estimate on costs, it was well over $10,000 of his own money to get a run of controllers made, and the minimum amount was sizeable, like a couple thousand controllers I think. This was also done before the COVID pandemic, so it would probably be more expensive now. Just throwing some numbers out there for people who are thinking of having a run of their own dreamcast controllers made. I can imagine that having support for the VMU and maple bus protocol would make dreamcast controllers even more expensive to recreate than the Jaguar controller, which has no special features other than an insane amount of buttons.