Saturn Mod  
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That's it, job finished
That's it, you've now got your country switch and your 50/60Hz switch, you just need to mount them and put the Saturn back together.
I put the switches in the front above the the joypad ports, mainly because you can make the holes easily, and there's a lot of room inside the case around there.
Here's what the completed project looks like
 
 

The Saturn with modifications completed.