I think my NES RGB mod is a failure. I was able to get the board slotted in what I thought was pretty good, but in doing so, I had to slightly bend some of the pins, so I'm assuming they're not making a good connection. I can't get a picture out of either s-video or composite (I'll occasionally get a blinking blue screen on composite, but I don't think that means much of anything, since I think you can still get that screen even if the PPU isn't connected, afaik).
Last resort would be to probably wire up every connection, but that would take a ton of effort and time and may still result in failure, so... probably not gonna bother. Desoldering everything from the RGB board is probably a no-go, too, since I was having a ton of difficulty removing solder from the vias, and would probably destroy the board during that process.
Sucks, but I have a working NES, so maybe I'll try to sell my mess on eBay lol. "For parts/as is, botched RGB mod" lol