I was searching for a good Saturn controller for my fighting games and this seemed like a cool project. I purchased the cheapest one I could find, which ended up being the PS version. It actually looked very similar to the first picture above, rust and all.
What was not mentioned in the tweet, is that these controllers come with at least two different PCB variants. This is important to note, because the header wiring is reversed depending which one you have. Mine was model 0888-31 (versus model 0888-100A).
CN2 is where the PlayStation cable was hooked up. CN1 is the unused Saturn header. I soldered in a spare Saturn controller cable which I sourced from a Gen 1 US pad - these are absolute shit so it won't be missed! Unlike the 0888-100A PCB, pin 1 is white. Stripping the controller cable was surprisingly difficult as they are very small gauge and have thread intertwined. I then soldered on additional wire for slack. I used the same colors except for the blue wire, which is now purple:
You can keep both controller cables connected, but I removed the PlayStation one as I intend to only use this with my Saturn. Restoration is ongoing so I will save those pics for a future post - but the controller works!