Oh man Bryan, I'm glad I read this. I installed my first board today in a 5200, and I got no signal. I thought maybe the 4050 was interfering somehow, so I pulled it and installed the board into the socket directly. Hooked up my cables, configured the jumpers, and it fired up right away. This is easily the most beautiful picture I've ever seen on an Atari, and I'd like to replace all my homebrew circuits with these boards! Unfortunately, I now have more soldering to do to put the 4052 back on the board.
Anyway, here are a couple of pics of my install (need to mount the jacks)...
Thanks Bryan for a great product, I'll be ordering a couple more soon!