You mean the ATX Power Supply? (...).
Partly, I meant the adapter between PSU and Mainboard, that you will get from that guy with the atxg4 site. Well, the warning I read, does apply to the AGP G4 adapter and the second possibility of making it, which is the version he sells, I don't know how it is with the QS adapter.
You may want to have an electrician look at the adapter wiring, before purchase, if there are not already potential risks in the sugguested wiring mod scheme.
I am curious how that will work with the QS case. Aren't some ATX PSUs bigger than the QS's?
In my AGP G4 there is room left, they even molded a part in the bottom plate that holds the PSU and the optical drives, so that it could hold a bigger PSU.
The AGP PSU is 14cm front to rear. The empty molded part is 1cm. (and there is still enough, space for cables).
From bottom to top it is 15cm long and there is ca. 1,3cm space.
Behind the PSU there is additional space left, too. It is 1cm and the PSu itself is 8,5cm thick.
But the QS PSU has this triangle nose that holds the PSU somewhere, though I do not really understand the purpose, since it is hold by the bottom already.