I could have sworn I uploaded a pic of mine back in Feb, but apparently not. I used the same box from Radio Shack that you used. I happened to see the pictures I took of it on my camera just last week, but needed space so I deleted them.
Anyway, where can I find the old FAQ with the PNP and resistor info? I can't seem to find it anymore. It looks like you made yours from the same old FAQ I had. I made the adapters back in '98 and at the time, I couldn't find the correct resistors at Radio Shack. That was before the time of ordering from mouser on the net, so I just used specs as close as I could find. However, since I didn't get the right resistors, my controller only works for a little while and then craps out. I've been wanting to fix it the right way, but can't find the specs anymore.
For whatever reason the 7800 adapter using transistors is in the 2600 FAQ.
http://www.atariage.com/2600/faq/index.html?SystemID=2600#sega