After a few prints, and adjustments, I believe this is the finished product v5. After changing some settings on my printer, its not as accurate, so I have included a file for anyone with the same issues, giving a little extra tolerance.
I created this to be used with a USB breakout board, to wire into a raspberry pi mounted inside an SNES
Still a work in progress and will be updated as I test fit and adjust things. clips off the face of the original controller port cover will need to be removed at the moment for this to work. However I have plans to update this to be used with no modification.