Looking over Wilhelm_I's website and tutorial here. He has done some amazing work on these 3 Rrod boards.
I do have a couple of 360's here that I wouldn't mind trying this on. Question for the pro
You said when solder starts to reflow it turns yellow/goldish. Where do you see that at? On the surface mount components? or under the GPU and CPU? If its under how the heck do you see that?
Also I had one motherboard once that started sizzling the capacitors behind the CPU. Not bad I stopped when I heard the 3 of the start. Do you think this motherboard is dead? Would it still work with the capacitors like this?
Awesome work and Thank You for all the help for everyone.

depends on how damaged the caps are the ceramic ones are usually quite resistant so this will probably be no problem...
Forget the color thingy it is bullshit you cannot see if the solder is reflowed, the only way to see it is when you move the GPU and it falls off
Keep the timings, this reflows the shit for sure...