I think I found the easiest way to do this without the expensive SCART cables. I can't find any literature on that 5v pin doing anything for video, so I'm assuming its not used. The ground pin is used for all the shielding (I'd think) so that would be a pain to solder from a DIN to 4 BNC's so the so...

I'm starting the pilgrimage to RGB, and am doing it on a Sega Genesis Version 1. There are some Cables that go from the 8 pin to SCART, then you need a SCART to BNC to get into an RGB monitor, (Like the Sony PMV, I plan to use). Either way, I'm proficient in soldering and DIY, but do not know the pi...