1.6b US version. ATX PSU Help

[subvtech]

I moved to France and I don't have a transformer of power to step down to 110v.  I have a PC ATX PSU with 16amps on 3.3, 5v, and 12v. There is also a +5vsb.

 

Can I just match the voltages from the original PSU (delta and functional) from the ATX PSU? 

Does 1.6b have 3.3v or 5v standby?

I really don't mind if I have to power the Xbox on and off from the ATX PSU itself and I don't mind that the supply will sit outside of the box. So can I skip the power STB and OK? Are there other concerns about connecting an ATX PSU other than non matching pinouts?

My ATX PSU is a DSP-220U B-3A

In France I am having a hard time finding a 240v PSU without having to buy a whole console which is a bit pricy. I could get a transformer, but I don't trust the ones I see on the market that are not huge black boxes. 

 

My Xbox:

1.6b (xcaliber video encoder with hynix ram)

Xecuter 3 modded with X3CP

2TB SATA

HDMI via Nintendo Wii adapter