I will wait to see the diagrams.
The only way that a 1 wire mod is possible is to have the mod clip over the onboard bios and use the 1 wire to %Volt to power it.
If you look at the mod page on xbox-scene they say that this mod is 2 pcb's so it will be interesting to see were these 2 boards go,1 must clip over the onboard bios and i would like to see were the second board goes
If this mod looks good i will buy it as i am thinking of getting this mod only so that i can flash the on board bios with EvoX and then remove it and keep using this mod to do the same to other xbox's.
Let hust hope it works well