I have modded around 3 snes for component and its very easy and there's not a lot of parts.
For your SNS-CPU-GPM-02 this is how I do it.
On pin 1(red)of the encoder add a 100uf cap,positive going to the chip.
On pin 24(blue)of the encoder add a 100uf cap,positive going to the chip.
On pin 7 of the multi out(green)add a 68ohm resister.
Now you can add jacks to the back of the system but I don't like drilling holes.
What I do is remove the rf modulator on the snes and add a trrs jack to the port,wire it all up,then use a 3.5mm av cable for component,for audio I use a regular snes av cable.