Couple issues I notice right off the bat.
First, I guess I forgot to put current requirements in the guide for each rail, but they are pretty high, especially 1v725 which is 11A or so. I don't think your regs are beefy enough for some of the rails.
Second, In my guide I said to pull up EJECT SW, but I later discovered this causes stability issues with booting and I haven't determined why yet, so I would probably undo that.
AV mode jumpers must always be set or the Xbox won't boot, because it will think there is no video cable plugged in.
Xcalibur reset must always be pulled down, otherwise the Xbox may not boot consistently.
I can't tell what some of your wiring is going to, but as long as you followed the rewiring diagram you should be fine.
I will update the guide to add current requirements, and to remove the note about the EJECT SW pull up, sorry about that.