Been working up a new cut which can be seen below. I havent had time to test it yet but I'm 99% sure it should work the way I want it to. Reason I'm trying this cut is because it does not require the removal/relocation of the little transistor chips for the controller ports and it does not require soldering straight to the AV chip. all that stuff is left on. As you can see its not really much bigger than a OMGWTF cut.
I have a similar cut, you don't need the capacitor on the video lines or the audio for it to work, the other capacitors are probably for the s video signal so they might not be needed either. I just can't figure out what transistors you need for full 4 players and both memory card slots to work.
And I can't get the custom regulator to work either, I think I've got too much amp draw off the 08080 which is doing the 1.9v
Updated first post with some new, much clearer/cleaner pics. Will be doing some major renovating to the guide over then next few days. Added a new cut also.
Just checked your guide again and it's much better!! Props for making it noob friendly. I'm busy with making a little guide for a Rev C board. I'll also make pics in a similar way to your guide that way you can add the info to your guide if you want.