Here is my take on it (kind of like what HercTNT said) and my first ever mod: https://imgur.com/boreE
I just finished building it today. I used an old AC adapter for a project box, 3 RCA extender (cheaper than buying 3 jacks although a bit hard to solder) and a PC front I/O port cable (since it's flat, I don't have to cut the EXP bay cover and both this and the power wire can run through the hole) to connect to the EXP port on the TG-16. I also made a little sticker to show what are the connections on the box. I have yellow for video, red for right audio, green for left audio and black is the unified ground for all three RCA connectors.
I just finished building it today. I used an old AC adapter for a project box, 3 RCA extender (cheaper than buying 3 jacks although a bit hard to solder) and a PC front I/O port cable (since it's flat, I don't have to cut the EXP bay cover and both this and the power wire can run through the hole) to connect to the EXP port on the TG-16. I also made a little sticker to show what are the connections on the box. I have yellow for video, red for right audio, green for left audio and black is the unified ground for all three RCA connectors.